Remove ImageLoadingTracker class

chrome/browser/extensions/extension_icon_image.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 "chrome/browser/extensions/extension_icon_image.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "chrome/browser/extensions/image_loader.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/notification_service.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/canvas_image_source.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/image/image_skia_source.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/size_conversions.h"
 
 // The ImageSkia provided by extensions::IconImage contains ImageSkiaReps that
 // are computed and updated using the following algorithm (if no default icon
 // was supplied, transparent icon is considered the default):
 // - |LoadImageForScaleFactors()| searches the extension for an icon of an
 //   appropriate size. If the extension doesn't have a icon resource needed for
 //   the image representation, the default icon's representation for the
 //   requested scale factor is returned by ImageSkiaSource.
 // - If the extension has the resource, IconImage tries to load it using
-//   ImageLoadingTracker.
-// - |ImageLoadingTracker| may return both synchronously and asynchronously.
-// 1. |ImageLoadingTracker| is synchronous.
-//  - If image representation resource is successfully loaded, the
-//    representation returned by ImageSkiaSource is created from the loaded
-//    bitmap.
-//  - If resource loading fails, ImageSkiaSource returns default icon's
-//    representation.
-// 2. |ImageLoadingTracker| is asynchronous.
+//   ImageLoader.
+// - |ImageLoader| is asynchronous.
 //  - ImageSkiaSource will initially return transparent image resource of the
 //    desired size.
 //  - The image will be updated with an appropriate image representation when
-//    the |ImageLoadingTracker| finishes. The image representation is chosen
-//    the same way as in the synchronous case. The observer is notified of the
-//    image change, unless the added image representation is transparent (in
-//    which case the image had already contained the appropriate image
+//    the |ImageLoader| finishes. The image representation is chosen the same
+//    way as in the synchronous case. The observer is notified of the image
+//    change, unless the added image representation is transparent (in which
+//    case the image had already contained the appropriate image
 //    representation).
 
 namespace {
 
 const int kMatchBiggerTreshold = 32;
 
 ExtensionResource GetExtensionIconResource(
     const extensions::Extension* extension,
     const ExtensionIconSet& icons,
     int size,
@@ skipping 181 matching lines @@
   DCHECK_EQ(type, chrome::NOTIFICATION_EXTENSION_UNLOADED);
 
   const Extension* extension =
       content::Details<extensions::UnloadedExtensionInfo>(details)->extension;
 
   if (extension_ == extension)
     extension_ = NULL;
 }
 
 }  // namespace extensions