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..6548aa81a0dd864619c64c4f2cbb78a727a07679 100644
--- a/chrome/browser/ui/gtk/avatar_menu_button_gtk.cc
+++ b/chrome/browser/ui/gtk/avatar_menu_button_gtk.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/gtk/avatar_menu_button_gtk.h"
 
 #include "base/i18n/rtl.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/gtk/avatar_menu_bubble_gtk.h"
@@ -46,6 +47,11 @@ 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;