Fix for pressing escape during a drag and drop operation.

chrome/browser/tab_contents/web_drag_source.h

 // Copyright (c) 2006-2008 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_TAB_CONTENTS_WEB_DRAG_SOURCE_H_
 #define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_SOURCE_H_
 
 #include "base/basictypes.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/gfx/point.h"
@@ skipping 17 matching lines @@
 //  continue, and supplies the appropriate cursors.
 //
 class WebDragSource : public BaseDragSource {
  public:
   // Create a new DragSource for a given HWND and RenderViewHost.
   WebDragSource(gfx::NativeWindow source_wnd, RenderViewHost* render_view_host);
   virtual ~WebDragSource() { }
 
  protected:
   // BaseDragSource
+  virtual void OnDragSourceCancel();
   virtual void OnDragSourceDrop();
   virtual void OnDragSourceMove();
 
  private:
   // Cannot construct thusly.
   WebDragSource();
 
   // Keep a reference to the window so we can translate the cursor position.
   gfx::NativeWindow source_wnd_;
 
   // We use this as a channel to the renderer to tell it about various drag
   // drop events that it needs to know about (such as when a drag operation it
   // initiated terminates).
   RenderViewHost* render_view_host_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragSource);
 };
 
 #endif  // #ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_SOURCE_H_