Make search icon in omnibox results hidpi

chrome/browser/ui/views/omnibox/omnibox_result_view_model.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_OMNIBOX_OMNIBOX_RESULT_VIEW_MODEL_H_
 #define CHROME_BROWSER_UI_VIEWS_OMNIBOX_OMNIBOX_RESULT_VIEW_MODEL_H_
 
-class SkBitmap;
+namespace gfx {
+class Image;
+}
 
 // An interface implemented by an object that provides data to populate
 // individual result views.
 class OmniboxResultViewModel {
  public:
   // Returns true if the index is selected.
   virtual bool IsSelectedIndex(size_t index) const = 0;
 
   // Returns true if the index is hovered.
   virtual bool IsHoveredIndex(size_t index) const = 0;
 
   // If |index| is a match from an extension, returns the extension icon;
-  // otherwise returns NULL.
-  virtual const SkBitmap* GetIconIfExtensionMatch(size_t index) const = 0;
+  // otherwise returns an empty gfx::Image.
+  virtual gfx::Image GetIconIfExtensionMatch(size_t index) const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_OMNIBOX_OMNIBOX_RESULT_VIEW_MODEL_H_