Simplify the text in the external protocol confirmation dialog.

chrome/browser/ui/protocol_dialog_delegate.h

 // Copyright (c) 2013 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_PROTOCOL_DIALOG_DELEGATE_H_
 #define CHROME_BROWSER_UI_PROTOCOL_DIALOG_DELEGATE_H_
 
+#include "ui/base/ui_base_types.h"
 #include "url/gurl.h"
 
 // Interface implemented by objects that wish to show a dialog box Window for
 // handling special protocols. The window that is displayed uses this interface
 // to determine the text displayed and notify the delegate object of certain
 // events.
 class ProtocolDialogDelegate {
  public:
   explicit ProtocolDialogDelegate(const GURL& url) : url_(url) {}
   virtual ~ProtocolDialogDelegate() {}
 
   // Called if the user has chosen to launch the application for this protocol.
   // |dont_block| is true if the checkbox to prevent future instances of this
   // dialog is checked.
   virtual void DoAccept(const GURL& url, bool dont_block) const = 0;
 
   // Called if the user has chosen to do nothing for this protocol.
   // |dont_block| is true if the checkbox to prevent future instances of this
   // dialog is checked.
   virtual void DoCancel(const GURL& url, bool dont_block) const = 0;
 
+  virtual base::string16 GetDialogButtonLabel(
+      ui::DialogButton button) const = 0;
   virtual base::string16 GetMessageText() const = 0;
   virtual base::string16 GetCheckboxText() const = 0;
   virtual base::string16 GetTitleText() const = 0;
 
   const GURL& url() const { return url_; }
 
  private:
   const GURL url_;
 };
 
 #endif  // CHROME_BROWSER_UI_PROTOCOL_DIALOG_DELEGATE_H_