Fixing notification message crash on fast dismissal click

ash/system/user/user_view.h

Index: ash/system/user/user_view.h
diff --git a/ash/system/user/user_view.h b/ash/system/user/user_view.h
index 303d8b11948ecba4fc347ce8d2d7ecaa1444de1b..774213e9f355b4a51113efff05b995a4e54f28cd 100644
--- a/ash/system/user/user_view.h
+++ b/ash/system/user/user_view.h
@@ -21,6 +21,10 @@ class Rect;
 class Size;
 }
 
+namespace views {
+class FocusManager;
+}
+
 namespace ash {
 
 class PopupMessage;
@@ -96,6 +100,9 @@ class UserView : public views::View,
   // The mouse watcher which takes care of out of window hover events.
   scoped_ptr<views::MouseWatcher> mouse_watcher_;
 
+  // The focus manager which we use to detect focus changes.
+  views::FocusManager* focus_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(UserView);
 };