Ensure that extension resources are loaded with the correct scaling applied on Windows.

ui/base/resource/resource_bundle.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 UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 345 matching lines @@
   // Platform specific image scaling is done here. Currently only implemented
   // for Windows.
   // |image| is the bitmap to be scaled.
   // |loaded_image_scale| is the current scale of the bitmap.
   // |desired_scale| is the desired scale of the bitmap.
   // Returns the scaled bitmap or the original bitmap.
  static SkBitmap PlatformScaleImage(const SkBitmap& image,
                                     float loaded_image_scale,
                                     float desired_scale);
 
- // Returns the scale to be used for loading an image. In all platforms except
- // windows this is based on the scale factors of the loaded resource packs.
- // On Windows this returns the device scale factor if high dpi is enabled.
- float PlatformGetImageScale();
-
   // This pointer is guaranteed to outlive the ResourceBundle instance and may
   // be NULL.
   Delegate* delegate_;
 
   // Protects |images_| and font-related members.
   scoped_ptr<base::Lock> images_and_fonts_lock_;
 
   // Protects |locale_resources_data_|.
   scoped_ptr<base::Lock> locale_resources_data_lock_;
 
@@ skipping 27 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ResourceBundle);
 };
 
 }  // namespace ui
 
 // TODO(beng): Someday, maybe, get rid of this.
 using ui::ResourceBundle;
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_