Fix race conditions in ImageDecoder.

chrome/browser/android/logo_service.cc

 // Copyright 2014 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/android/logo_service.h"
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/image_decoder.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
@@ skipping 22 matching lines @@
   const char kGoogleDoodleURLPath[] = "async/newtab_mobile";
   GURL::Replacements replacements;
   replacements.SetPathStr(kGoogleDoodleURLPath);
   return google_base_url.ReplaceComponents(replacements);
 }
 
 class LogoDecoderDelegate : public ImageDecoder::ImageRequest {
  public:
   LogoDecoderDelegate(
       const base::Callback<void(const SkBitmap&)>& image_decoded_callback)
-      : ImageRequest(base::MessageLoopProxy::current()),
-        image_decoded_callback_(image_decoded_callback),
+      : image_decoded_callback_(image_decoded_callback),
         weak_ptr_factory_(this) {
     // If the ImageDecoder crashes or otherwise never completes, call
     // OnImageDecodeTimedOut() eventually to ensure that image_decoded_callback_
     // is run.
     base::MessageLoopProxy::current()->PostDelayedTask(
         FROM_HERE, base::Bind(&LogoDecoderDelegate::OnDecodeImageFailed,
                               weak_ptr_factory_.GetWeakPtr()),
         base::TimeDelta::FromSeconds(kDecodeLogoTimeoutSeconds));
   }
 
@@ skipping 94 matching lines @@
 }
 
 LogoServiceFactory::~LogoServiceFactory() {}
 
 KeyedService* LogoServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
   DCHECK(!profile->IsOffTheRecord());
   return new LogoService(profile);
 }