[geary] Remove some uses of the deprecated GearyApplication.instance prop.

[Michael Gratton <mjog src gnome org>]

commit f708218c2bf0f70d9ea1b9a622b84287b878045a
Author: Michael James Gratton <mike vee net>
Date:   Wed Oct 4 17:44:41 2017 +1100

    Remove some uses of the deprecated GearyApplication.instance prop.

 src/client/application/autostart-manager.vala |   36 ++++++++++++++-----------
 src/client/application/geary-controller.vala  |   10 ++++---
 src/client/application/secret-mediator.vala   |   11 +++++--
 3 files changed, 34 insertions(+), 23 deletions(-)
---
diff --git a/src/client/application/autostart-manager.vala b/src/client/application/autostart-manager.vala
index 93b34f8..37d1c44 100644
--- a/src/client/application/autostart-manager.vala
+++ b/src/client/application/autostart-manager.vala
@@ -9,17 +9,20 @@
  * desktop file at $HOME/.config/autostart/geary.desktop
  */
 public class AutostartManager : Object {
+
     private const string AUTOSTART_FOLDER = "autostart";
     private const string AUTOSTART_DESKTOP_FILE = "geary-autostart.desktop";
 
+    private GearyApplication instance;
     private File startup_file; // Startup '.desktop' file
 
-    public AutostartManager() {
-        startup_file = File.new_for_path(Environment.get_user_config_dir()).get_child(AUTOSTART_FOLDER)
+    public AutostartManager(GearyApplication instance) {
+        this.instance = instance;
+        this.startup_file = File.new_for_path(Environment.get_user_config_dir()).get_child(AUTOSTART_FOLDER)
             .get_child(AUTOSTART_DESKTOP_FILE);
-        
+
         // Connect startup-notifications option callback
-        GearyApplication.instance.config.settings.changed[Configuration.STARTUP_NOTIFICATIONS_KEY].connect(
+        this.instance.config.settings.changed[Configuration.STARTUP_NOTIFICATIONS_KEY].connect(
             on_startup_notification_change);
     }
 
@@ -27,11 +30,11 @@ public class AutostartManager : Object {
      * Returns the system-wide autostart desktop file
      */
     public File? get_autostart_desktop_file() {
-        File? install_dir = GearyApplication.instance.get_install_dir();
+        File? install_dir = this.instance.get_install_dir();
         File desktop_file = (install_dir != null)
             ? install_dir.get_child("share").get_child("applications").get_child(AUTOSTART_DESKTOP_FILE)
             : 
File.new_for_path(GearyApplication.SOURCE_ROOT_DIR).get_child("build").get_child("desktop").get_child(AUTOSTART_DESKTOP_FILE);
-        
+
         return desktop_file.query_exists() ? desktop_file : null;
     }
 
@@ -39,9 +42,9 @@ public class AutostartManager : Object {
      * Deletes the desktop file from autostart directory.
      */
     public void delete_startup_file() {
-        if (startup_file.query_exists()) {
+        if (this.startup_file.query_exists()) {
             try {
-                startup_file.delete();
+                this.startup_file.delete();
             } catch (Error err) {
                 message("Failed to delete startup file: %s", err.message);
             }
@@ -52,39 +55,40 @@ public class AutostartManager : Object {
      * Creates .desktop file in autostart directory (usually '$HOME/.config/autostart/') if no one exists.
      */
     public void create_startup_file() {
-        if (startup_file.query_exists())
+        if (this.startup_file.query_exists())
             return;
-        
+
         try {
-            File autostart_dir = startup_file.get_parent();
+            File autostart_dir = this.startup_file.get_parent();
             if (!autostart_dir.query_exists())
                 autostart_dir.make_directory_with_parents();
             File? autostart = get_autostart_desktop_file();
             if (autostart == null) {
                 message("Autostart file is not installed!");
             } else {
-                autostart.copy(startup_file, 0);
+                autostart.copy(this.startup_file, 0);
             }
         } catch (Error err) {
             message("Failed to create startup file: %s", err.message);
         }
     }
-   
+
     /**
      * Callback for startup notification option changes.
      */
     public void on_startup_notification_change() {
-        if (GearyApplication.instance.config.startup_notifications)
+        if (this.instance.config.startup_notifications)
             create_startup_file();
         else
             delete_startup_file();
     }
-    
+
     /*
      * A convenience method. The purpose of this method is to synchronize the state of startup notifications 
setting
      * with the actual state of the file, so it's not misleading for the user (the option is checked while 
the file doesn't exist)
      */
     public void sync_with_config() {
-        GearyApplication.instance.config.startup_notifications = startup_file.query_exists(); 
+        this.instance.config.startup_notifications = this.startup_file.query_exists();
     }
+
 }
diff --git a/src/client/application/geary-controller.vala b/src/client/application/geary-controller.vala
index 8f4e164..5ad6247 100644
--- a/src/client/application/geary-controller.vala
+++ b/src/client/application/geary-controller.vala
@@ -267,8 +267,8 @@ public class GearyController : Geary.BaseObject {
         this.main_window.conversation_list_view.grab_focus();
 
         // instantiate here to ensure that Config is initialized and ready
-        autostart_manager = new AutostartManager();
-        
+        this.autostart_manager = new AutostartManager(this.application);
+
         // initialize revokable
         save_revokable(null, null);
 
@@ -286,7 +286,7 @@ public class GearyController : Geary.BaseObject {
                 this.application.get_user_config_directory(),
                 this.application.get_user_data_directory(),
                 this.application.get_resource_directory(),
-                new SecretMediator()
+                new SecretMediator(this.application)
             );
             if (Geary.Engine.instance.get_accounts().size == 0) {
                 create_account();
@@ -325,7 +325,9 @@ public class GearyController : Geary.BaseObject {
         
         // drop the Revokable, which will commit it if necessary
         save_revokable(null, null);
-        
+
+        this.autostart_manager = null;
+
         // close the ConversationMonitor
         try {
             if (current_conversations != null) {
diff --git a/src/client/application/secret-mediator.vala b/src/client/application/secret-mediator.vala
index f3d8d61..f9bbc34 100644
--- a/src/client/application/secret-mediator.vala
+++ b/src/client/application/secret-mediator.vala
@@ -20,9 +20,14 @@ public class SecretMediator : Geary.CredentialsMediator, Object {
         null
     );
 
+    private GearyApplication instance;
     private Geary.Nonblocking.Mutex dialog_mutex = new Geary.Nonblocking.Mutex();
 
 
+    public SecretMediator(GearyApplication instance) {
+        this.instance = instance;
+    }
+
     public virtual async string? get_password_async(Geary.Service service,
                                                     Geary.AccountInformation account,
                                                     Cancellable? cancellable = null)
@@ -89,14 +94,14 @@ public class SecretMediator : Geary.CredentialsMediator, Object {
         // to prevent multiple dialogs from popping up at the same time, use a nonblocking mutex
         // to serialize the code
         int token = yield dialog_mutex.claim_async(null);
-        
+
         // If the main window is hidden, make it visible now and present to user as transient parent
-        Gtk.Window? main_window = GearyApplication.instance.controller.main_window;
+        Gtk.Window? main_window = this.instance.get_active_window();
         if (main_window != null && !main_window.visible) {
             main_window.show_all();
             main_window.present_with_time(Gdk.CURRENT_TIME);
         }
-        
+
         PasswordDialog password_dialog = new PasswordDialog(main_window, services.has_smtp(),
             account_information, services);
         bool result = password_dialog.run();