chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/session_crashed_bubble_view.h

 // Copyright 2014 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_SESSION_CRASHED_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_SESSION_CRASHED_BUBBLE_VIEW_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/ui/session_crashed_bubble.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/reload_type.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/views/bubble/bubble_dialog_delegate.h"
 #include "ui/views/controls/styled_label_listener.h"
 
 namespace views {
 class Checkbox;
-class GridLayout;
 class Widget;
 }
 
 namespace content {
 class WebContents;
 }
 
 class Browser;
 
 // It creates a session restore request bubble when the previous session has
@@ skipping 86 matching lines @@
   bool started_navigation_;
 
   // Whether or not the user chose to restore previous session. It is used to
   // collect bubble usage stats.
   bool restored_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionCrashedBubbleView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_SESSION_CRASHED_BUBBLE_VIEW_H_