Remove unused code in ConfirmBubbleModel

chrome/browser/ui/cocoa/confirm_bubble_controller.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/ui/cocoa/confirm_bubble_controller.h"
 
 #include "base/strings/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/confirm_bubble_cocoa.h"
 #import "chrome/browser/ui/confirm_bubble_model.h"
@@ skipping 51 matching lines @@
 }
 
 - (BOOL)hasOkButton {
   return (model_->GetButtons() & ConfirmBubbleModel::BUTTON_OK) ? YES : NO;
 }
 
 - (BOOL)hasCancelButton {
   return (model_->GetButtons() & ConfirmBubbleModel::BUTTON_CANCEL) ? YES : NO;
 }
 
-- (NSImage*)icon {
-  gfx::Image* image = model_->GetIcon();
-  return !image ? nil : image->ToNSImage();
-}
-
 // Action handlers.
 - (void)accept {
   model_->Accept();
 }
 
 - (void)cancel {
   model_->Cancel();
 }
 
 - (void)linkClicked {
   model_->LinkClicked();
 }
 
 @end