Remove unused code in ConfirmBubbleModel

chrome/browser/ui/test/test_confirm_bubble_model.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_TEST_TEST_CONFIRM_BUBBLE_MODEL_H_
 #define CHROME_BROWSER_UI_TEST_TEST_CONFIRM_BUBBLE_MODEL_H_
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/confirm_bubble_model.h"
 
 // A test version of the model for confirmation bubbles.
 class TestConfirmBubbleModel : public ConfirmBubbleModel {
  public:
   // Parameters may be NULL depending on the needs of the test.
   TestConfirmBubbleModel(bool* model_deleted,
                          bool* accept_clicked,
                          bool* cancel_clicked,
                          bool* link_clicked);
   ~TestConfirmBubbleModel() override;
 
   // ConfirmBubbleModel overrides:
   base::string16 GetTitle() const override;
   base::string16 GetMessageText() const override;
-  gfx::Image* GetIcon() const override;
   int GetButtons() const override;
   base::string16 GetButtonLabel(BubbleButton button) const override;
   void Accept() override;
   void Cancel() override;
   base::string16 GetLinkText() const override;
   void LinkClicked() override;
 
  private:
   bool* model_deleted_;
   bool* accept_clicked_;
   bool* cancel_clicked_;
   bool* link_clicked_;
 
   DISALLOW_COPY_AND_ASSIGN(TestConfirmBubbleModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TEST_TEST_CONFIRM_BUBBLE_MODEL_H_