Add a class to replace ImageLoadingTracker with a nicer API.

chrome/browser/extensions/image_loading_tracker.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_EXTENSIONS_IMAGE_LOADING_TRACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 104 matching lines @@
   // type.
   void LoadImages(const extensions::Extension* extension,
                   const std::vector<ImageRepresentation>& info_list,
                   CacheParam cache);
 
   // Returns the ID used for the next image that is loaded. That is, the return
   // value from this method corresponds to the int that is passed to
   // OnImageLoaded() the next time LoadImage() is invoked.
   int next_id() const { return next_id_; }
 
-  // Checks whether image is a component extension resource. Returns false
-  // if a given |resource| does not have a corresponding image in bundled
-  // resources. Otherwise fills |resource_id|.
-  static bool IsComponentExtensionResource(
-      const extensions::Extension* extension,
-      const FilePath& resource_path,
-      int* resource_id);
-
  private:
   // Information for pending resource load operation for one or more image
   // representations.
   struct PendingLoadInfo {
     PendingLoadInfo();
     ~PendingLoadInfo();
 
     const extensions::Extension* extension;
     // This is cached separate from |extension| in case the extension is
     // unloaded.
@@ skipping 34 matching lines @@
   // Information for each LoadImage request is cached here. The integer
   // identifies the id assigned to the request.
   LoadMap load_map_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageLoadingTracker);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_