Remove ImageLoadingTracker class

chrome/browser/extensions/extension_icon_manager_unittest.cc

 // 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.
 
 #include "base/json/json_file_value_serializer.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_icon_manager.h"
 #include "chrome/common/chrome_paths.h"
@@ skipping 58 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ExtensionIconManagerTest);
 };
 
 // This is a specialization of ExtensionIconManager, with a special override to
 // call back to the test when an icon has completed loading.
 class TestIconManager : public ExtensionIconManager {
  public:
   explicit TestIconManager(ExtensionIconManagerTest* test) : test_(test) {}
   virtual ~TestIconManager() {}
 
-  // Implements the ImageLoadingTracker::Observer interface, and calls through
-  // to the base class' implementation. Then it lets the test know that an
-  // image load was observed.
+  // Overrides the ImageLoader callback, and calls through to the base class'
+  // implementation. Then it lets the test know that an image load was observed.
   virtual void OnImageLoaded(const std::string& extension_id,
                              const gfx::Image& image) OVERRIDE {
     ExtensionIconManager::OnImageLoaded(extension_id, image);
     test_->ImageLoadObserved();
   }
 
  private:
   ExtensionIconManagerTest* test_;
 
   DISALLOW_COPY_AND_ASSIGN(TestIconManager);
@@ skipping 84 matching lines @@
   // Now re-load the icon - we should get the same result bitmap (and not the
   // default icon).
   icon_manager.LoadIcon(profile.get(), extension.get());
   WaitForImageLoad();
   SkBitmap second_icon = icon_manager.GetIcon(extension->id());
   EXPECT_FALSE(gfx::BitmapsAreEqual(second_icon, default_icon));
 
   EXPECT_TRUE(gfx::BitmapsAreEqual(first_icon, second_icon));
 }
 #endif