Remove unused code in ConfirmBubbleModel

chrome/browser/renderer_context_menu/spelling_bubble_model.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_RENDERER_CONTEXT_MENU_SPELLING_BUBBLE_MODEL_H_
 #define CHROME_BROWSER_RENDERER_CONTEXT_MENU_SPELLING_BUBBLE_MODEL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/confirm_bubble_model.h"
 
 class Profile;
 
 namespace content {
 class WebContents;
 }
 
 // A class that implements a bubble menu shown when we confirm a user allows
 // integrating the spelling service of Google to Chrome.
 class SpellingBubbleModel : public ConfirmBubbleModel {
  public:
   SpellingBubbleModel(Profile* profile,
                       content::WebContents* web_contents,
                       bool include_autocorrect);
   ~SpellingBubbleModel() override;
 
   // ConfirmBubbleModel implementation.
   base::string16 GetTitle() const override;
   base::string16 GetMessageText() const override;
-  gfx::Image* GetIcon() const override;
   base::string16 GetButtonLabel(BubbleButton button) const override;
   void Accept() override;
   void Cancel() override;
   base::string16 GetLinkText() const override;
   void LinkClicked() override;
 
  private:
   // Set the profile preferences to enable or disable the feature.
   void SetPref(bool enabled);
 
   Profile* profile_;
   content::WebContents* web_contents_;
   bool include_autocorrect_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellingBubbleModel);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_CONTEXT_MENU_SPELLING_BUBBLE_MODEL_H_