Make avatar menu bubble as singleton and destroy all the menu items and menu model when bubble cl...

chrome/browser/ui/gtk/avatar_menu_bubble_gtk.cc

Index: chrome/browser/ui/gtk/avatar_menu_bubble_gtk.cc
===================================================================
--- chrome/browser/ui/gtk/avatar_menu_bubble_gtk.cc	(revision 106832)
+++ chrome/browser/ui/gtk/avatar_menu_bubble_gtk.cc	(working copy)
@@ -54,12 +54,20 @@
                             true,  // |grab_input|
                             theme_service_,
                             this);  // |delegate|
+  g_signal_connect(contents_, "destroy",
+                   G_CALLBACK(&OnDestroyThunk), this);
 }
 
 AvatarMenuBubbleGtk::~AvatarMenuBubbleGtk() {
   STLDeleteContainerPointers(items_.begin(), items_.end());
 }
 
+void AvatarMenuBubbleGtk::OnDestroy(GtkWidget* widget) {
+  // We are self deleting, we have a destroy signal setup to catch when we
+  // destroyed (via the BubbleGtk being destroyed), and delete ourself.
+  delete this;
+}
+
 void AvatarMenuBubbleGtk::BubbleClosing(BubbleGtk* bubble,
                                         bool closed_by_escape) {
 }