[dconf-editor] Remove some unused methods.

[Arnaud B. <arnaudb src gnome org>]

commit 14e05556f5ae2a68c68a3bb3ac693155b144d3a7
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Jan 20 04:40:30 2019 +0100

    Remove some unused methods.
    
    These overrides were completely useless.

 editor/base-headerbar.vala      |  4 +---
 editor/bookmarks-headerbar.vala |  8 ++++----
 editor/browser-headerbar.vala   | 14 --------------
 3 files changed, 5 insertions(+), 21 deletions(-)
---
diff --git a/editor/base-headerbar.vala b/editor/base-headerbar.vala
index f92550b..68f18d2 100644
--- a/editor/base-headerbar.vala
+++ b/editor/base-headerbar.vala
@@ -304,8 +304,6 @@ private class BaseHeaderBar : NightTimeAwareHeaderBar, AdaptativeWidget
 
     internal virtual bool has_popover ()
     {
-        if (info_button.active)
-            return true;
-        return false;
+        return info_button.active;
     }
 }
diff --git a/editor/bookmarks-headerbar.vala b/editor/bookmarks-headerbar.vala
index 0475768..54848a5 100644
--- a/editor/bookmarks-headerbar.vala
+++ b/editor/bookmarks-headerbar.vala
@@ -272,18 +272,18 @@ private abstract class BookmarksHeaderBar : BrowserHeaderBar, AdaptativeWidget
     * * keyboard calls
     \*/
 
-    internal override bool next_match ()
+    internal virtual bool next_match ()
     {
         if (bookmarks_button.active)
             return bookmarks_button.next_match ();
-        return base.next_match ();      // false
+        return false;
     }
 
-    internal override bool previous_match ()
+    internal virtual bool previous_match ()
     {
         if (bookmarks_button.active)
             return bookmarks_button.previous_match ();
-        return base.previous_match ();  // false
+        return false;
     }
 
     internal bool handle_copy_text (out string copy_text)
diff --git a/editor/browser-headerbar.vala b/editor/browser-headerbar.vala
index c7df05c..d0cccee 100644
--- a/editor/browser-headerbar.vala
+++ b/editor/browser-headerbar.vala
@@ -170,20 +170,6 @@ private abstract class BrowserHeaderBar : BaseHeaderBar, AdaptativeWidget
                                               true);            /* show quit_button_stack   */
     }
 
-    /*\
-    * * keyboard calls
-    \*/
-
-    internal virtual bool next_match ()
-    {
-        return false;
-    }
-
-    internal virtual bool previous_match ()
-    {
-        return false;
-    }
-
     /*\
     * * popovers methods
     \*/