Fixes a crash when InkDropDelegate gets destroyed after its InkDropHost

chrome/browser/ui/views/toolbar/toolbar_action_view.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_ACTION_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_ACTION_VIEW_H_
 
 #include "base/callback.h"
 #include "chrome/browser/ui/views/toolbar/toolbar_action_view_delegate_views.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 165 matching lines @@
 
   // If non-null, this is the next toolbar action context menu that wants to run
   // once the current owner (this one) is done.
   base::Closure followup_context_menu_task_;
 
   // The time the popup was last closed.
   base::TimeTicks popup_closed_time_;
 
   content::NotificationRegistrar registrar_;
 
+  scoped_ptr<views::InkDropDelegate> ink_drop_delegate_;
+
   base::WeakPtrFactory<ToolbarActionView> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ToolbarActionView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_ACTION_VIEW_H_