Add a button to exit managed mode.

chrome/browser/ui/gtk/avatar_menu_button_gtk.cc

Index: chrome/browser/ui/gtk/avatar_menu_button_gtk.cc
diff --git a/chrome/browser/ui/gtk/avatar_menu_button_gtk.cc b/chrome/browser/ui/gtk/avatar_menu_button_gtk.cc
index 411f721afde9d7ed30807b71061684389adde246..c6ebbb127949f41c394adfca2984a3a6d3c75491 100644
--- a/chrome/browser/ui/gtk/avatar_menu_button_gtk.cc
+++ b/chrome/browser/ui/gtk/avatar_menu_button_gtk.cc
@@ -5,8 +5,12 @@
 #include "chrome/browser/ui/gtk/avatar_menu_button_gtk.h"
 
 #include "base/i18n/rtl.h"
+#include "chrome/app/chrome_command_ids.h"
+#include "chrome/browser/command_updater.h"
+#include "chrome/browser/managed_mode.h"
 #include "chrome/browser/profiles/profile_metrics.h"
 #include "chrome/browser/profiles/profile_info_util.h"
+#include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/gtk/avatar_menu_bubble_gtk.h"
 #include "chrome/browser/ui/gtk/bubble/bubble_gtk.h"
 #include "ui/gfx/gtk_util.h"
@@ -46,6 +50,11 @@ gboolean AvatarMenuButtonGtk::OnButtonPressed(GtkWidget* widget,
   if (event->button != 1)
     return FALSE;
 
+  if (ManagedMode::IsInManagedMode()) {
+    ManagedMode::LeaveManagedMode();
+    return TRUE;
+  }
+
   ShowAvatarBubble();
   ProfileMetrics::LogProfileOpenMethod(ProfileMetrics::ICON_AVATAR_BUBBLE);
   return TRUE;
@@ -58,6 +67,7 @@ void AvatarMenuButtonGtk::OnSizeAllocate(GtkWidget* widget,
 }
 
 void AvatarMenuButtonGtk::ShowAvatarBubble() {
+  DCHECK(browser_->command_updater()->IsCommandEnabled(IDC_SHOW_AVATAR_MENU));
   // Only show the avatar bubble if the avatar button is in the title bar.
   if (gtk_widget_get_parent_window(widget_.get()))
     new AvatarMenuBubbleGtk(browser_, widget_.get(), arrow_location_, NULL);