Fix the crash that could occur when the window is closed while web contents drag is in progress.

content/browser/web_contents/web_contents_view_win.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_WIN_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_WIN_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer.h"
@@ skipping 53 matching lines @@
   virtual void GetContainerBounds(gfx::Rect *out) const OVERRIDE;
   virtual void SetPageTitle(const string16& title) OVERRIDE;
   virtual void OnTabCrashed(base::TerminationStatus status,
                             int error_code) OVERRIDE;
   virtual void SizeContents(const gfx::Size& size) OVERRIDE;
   virtual void RenderViewCreated(content::RenderViewHost* host) OVERRIDE;
   virtual void Focus() OVERRIDE;
   virtual void SetInitialFocus() OVERRIDE;
   virtual void StoreFocus() OVERRIDE;
   virtual void RestoreFocus() OVERRIDE;
-  virtual bool IsDoingDrag() const OVERRIDE;
-  virtual void CancelDragAndCloseTab() OVERRIDE;
   virtual WebDropData* GetDropData() const OVERRIDE;
   virtual bool IsEventTracking() const OVERRIDE;
   virtual void CloseTabAfterEventTracking() OVERRIDE;
   virtual gfx::Rect GetViewBounds() const OVERRIDE;
 
   // Implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
       const content::ContextMenuParams& params,
       content::ContextMenuSourceType type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
@@ skipping 47 matching lines @@
 
   scoped_ptr<content::WebContentsViewDelegate> delegate_;
 
   // The helper object that handles drag destination related interactions with
   // Windows.
   scoped_refptr<WebDragDest> drag_dest_;
 
   // Used to handle the drag-and-drop.
   scoped_refptr<WebContentsDragWin> drag_handler_;
 
-  // Set to true if we want to close the tab after the system drag operation
-  // has finished.
-  bool close_tab_after_drag_ends_;
-
-  // Used to close the tab after the stack has unwound.
-  base::OneShotTimer<WebContentsViewWin> close_tab_timer_;
-
   scoped_ptr<ui::HWNDMessageFilter> hwnd_message_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewWin);
 };
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_WIN_H_