Add "remember my choice" checkbox for windows external protocol dialog....

chrome/browser/views/external_protocol_dialog.h

 // Copyright (c) 2009 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_EXTERNAL_PROTOCOL_DIALOG_H_
 #define CHROME_BROWSER_EXTERNAL_PROTOCOL_DIALOG_H_
 
 #include "base/time.h"
 #include "googleurl/src/gurl.h"
 #include "views/window/dialog_delegate.h"
@@ skipping 13 matching lines @@
   static std::wstring GetApplicationForProtocol(const GURL& url);
 
   virtual ~ExternalProtocolDialog();
 
   // views::DialogDelegate Methods:
   virtual int GetDefaultDialogButton() const;
   virtual std::wstring GetDialogButtonLabel(
       MessageBoxFlags::DialogButton button) const;
   virtual std::wstring GetWindowTitle() const;
   virtual void DeleteDelegate();
+  virtual bool Cancel();
   virtual bool Accept();
   virtual views::View* GetContentsView();
 
   // views::WindowDelegate Methods:
   virtual bool IsAlwaysOnTop() const { return false; }
   virtual bool IsModal() const { return false; }
 
  private:
   // The message box view whose commands we handle.
   MessageBoxView* message_box_view_;
 
   // The associated TabContents.
   TabContents* tab_contents_;
 
   // URL of the external protocol request.
   GURL url_;
 
   // The time at which this dialog was created.
   base::Time creation_time_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalProtocolDialog);
 };
 
 #endif // CHROME_BROWSER_EXTERNAL_PROTOCOL_DIALOG_H_