Remove some dead code for permission bubbles.

chrome/browser/ui/website_settings/mock_permission_bubble_request.h

 // Copyright 2014 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_WEBSITE_SETTINGS_MOCK_PERMISSION_BUBBLE_REQUEST_H_
 #define CHROME_BROWSER_UI_WEBSITE_SETTINGS_MOCK_PERMISSION_BUBBLE_REQUEST_H_
 
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/website_settings/permission_bubble_request.h"
 #include "url/gurl.h"
 
 class MockPermissionBubbleRequest : public PermissionBubbleRequest {
  public:
   MockPermissionBubbleRequest();
   explicit MockPermissionBubbleRequest(const std::string& text);
   explicit MockPermissionBubbleRequest(const std::string& text,
                                        const GURL& url);
   explicit MockPermissionBubbleRequest(const std::string& text,
                                        const std::string& accept_label,
                                        const std::string& deny_label);
   ~MockPermissionBubbleRequest() override;
 
   int GetIconId() const override;
-  base::string16 GetMessageText() const override;
   base::string16 GetMessageTextFragment() const override;
   GURL GetOrigin() const override;
 
   void PermissionGranted() override;
   void PermissionDenied() override;
   void Cancelled() override;
   void RequestFinished() override;
 
   bool granted();
   bool cancelled();
   bool finished();
 
  private:
   bool granted_;
   bool cancelled_;
   bool finished_;
 
   base::string16 text_;
   base::string16 accept_label_;
   base::string16 deny_label_;
   GURL origin_;
 };
 
 #endif  // CHROME_BROWSER_UI_WEBSITE_SETTINGS_MOCK_PERMISSION_BUBBLE_REQUEST_H_