Remove ImageLoadingTracker class

chrome/browser/ui/cocoa/extensions/browser_action_button.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/extensions/browser_action_button.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/logging.h"
@@ skipping 41 matching lines @@
       : owner_(owner),
         browser_action_([[owner cell] extensionAction]),
         icon_factory_(profile, extension, browser_action_, this) {
     registrar_.Add(
         this, chrome::NOTIFICATION_EXTENSION_BROWSER_ACTION_UPDATED,
         content::Source<ExtensionAction>(browser_action_));
   }
 
   virtual ~ExtensionActionIconFactoryBridge() {}
 
-  // ImageLoadingTracker::Observer implementation.
+  // ExtensionActionIconFactory::Observer implementation.
   void OnIconUpdated() OVERRIDE {
     [owner_ updateState];
   }
 
   // Overridden from content::NotificationObserver.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) {
     if (type == chrome::NOTIFICATION_EXTENSION_BROWSER_ACTION_UPDATED)
       [owner_ updateState];
@@ skipping 255 matching lines @@
                operation:NSCompositeSourceOver
                 fraction:enabled ? 1.0 : 0.4
           respectFlipped:YES
                    hints:nil];
 
   cellFrame.origin.y += kBrowserActionBadgeOriginYOffset;
   [self drawBadgeWithinFrame:cellFrame];
 }
 
 @end