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_aura.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_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 45 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;
 
   // Overridden from RenderViewHostDelegateView:
   virtual void ShowContextMenu(
       const content::ContextMenuParams& params,
       content::ContextMenuSourceType type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
@@ skipping 51 matching lines @@
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   content::RenderWidgetHostView* view_;
 
   scoped_ptr<content::WebContentsViewDelegate> delegate_;
 
   WebKit::WebDragOperationsMask current_drag_op_;
 
-  // Set to true if we want to close the tab after the system drag operation
-  // has finished.
-  bool close_tab_after_drag_ends_;
-
   content::WebDragDestDelegate* drag_dest_delegate_;
 
   // We keep track of the render view host we're dragging over.  If it changes
   // during a drag, we need to re-send the DragEnter message.  WARNING:
   // this pointer should never be dereferenced.  We only use it for comparing
   // pointers.
   void* current_rvh_for_drag_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_