Clean up IconLoader.

chrome/browser/icon_loader_mac.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.
 
 #include "chrome/browser/icon_loader.h"
 
 #import <AppKit/AppKit.h>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 34 matching lines @@
       default:
         NOTREACHED();
     }
     gfx::ImageSkia image_skia(gfx::ImageSkiaFromResizedNSImage(icon, size));
     if (!image_skia.isNull()) {
       image_skia.MakeThreadSafe();
       image_.reset(new gfx::Image(image_skia));
     }
   }
 
-  target_task_runner_->PostTask(FROM_HERE,
-      base::Bind(&IconLoader::NotifyDelegate, this));
+  target_task_runner_->PostTask(
+      FROM_HERE, base::Bind(callback_, base::Passed(&image_), group_));
+  delete this;
 }