[epiphany] downloads-manager: Don't assert on failure to acquire session inhibitor

[Michael Catanzaro <mcatanzaro src gnome org>]

commit aa22f74c39e0276ed5800620632e23b13ac97bb0
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed Feb 24 17:21:16 2016 -0600

    downloads-manager: Don't assert on failure to acquire session inhibitor
    
    This can happen if gnome-session is broken, or when running outside of
    GNOME.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762651

 embed/ephy-downloads-manager.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/embed/ephy-downloads-manager.c b/embed/ephy-downloads-manager.c
index 9fc714b..b7c1b2a 100644
--- a/embed/ephy-downloads-manager.c
+++ b/embed/ephy-downloads-manager.c
@@ -57,6 +57,9 @@ ephy_downloads_manager_acquire_session_inhibitor (EphyDownloadsManager *manager)
                                                        NULL,
                                                        GTK_APPLICATION_INHIBIT_LOGOUT | 
GTK_APPLICATION_INHIBIT_SUSPEND,
                                                       "Downloading");
+
+  if (manager->inhibitor_cookie == 0)
+    g_warning ("Failed to acquire session inhibitor for active download. Is gnome-session running?");
 }
 
 static void
@@ -65,10 +68,11 @@ ephy_downloads_manager_release_session_inhibitor (EphyDownloadsManager *manager)
   if (--manager->inhibitors > 0)
     return;
 
-  g_assert (manager->inhibitor_cookie > 0);
-  gtk_application_uninhibit (GTK_APPLICATION (ephy_embed_shell_get_default ()),
-                             manager->inhibitor_cookie);
-  manager->inhibitor_cookie = 0;
+  if (manager->inhibitor_cookie > 0) {
+    gtk_application_uninhibit (GTK_APPLICATION (ephy_embed_shell_get_default ()),
+                               manager->inhibitor_cookie);
+    manager->inhibitor_cookie = 0;
+  }
 }
 
 static void