Fix race conditions in ImageDecoder.

chrome/browser/profiles/profile_downloader.cc

 // Copyright (c) 2013 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/profiles/profile_downloader.h"
 
 #include <string>
 #include <vector>
 
 #include "base/json/json_reader.h"
@@ skipping 175 matching lines @@
   const std::string& photo_id = path_components[kPhotoIdPathComponentIndex];
   const std::string& photo_version =
       path_components[kPhotoVersionPathComponentIndex];
 
   // Check that the ID and version match the default Picasa profile photo.
   return photo_id == kPicasaPhotoId &&
          photo_version == kDefaultPicasaPhotoVersion;
 }
 
 ProfileDownloader::ProfileDownloader(ProfileDownloaderDelegate* delegate)
-    : ImageRequest(
-          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI)),
-      OAuth2TokenService::Consumer("profile_downloader"),
+    : OAuth2TokenService::Consumer("profile_downloader"),
       delegate_(delegate),
       picture_status_(PICTURE_FAILED) {
   DCHECK(delegate_);
 }
 
 void ProfileDownloader::Start() {
   StartForAccount(std::string());
 }
 
 void ProfileDownloader::StartForAccount(const std::string& account_id) {
@@ skipping 208 matching lines @@
 void ProfileDownloader::OnGetTokenFailure(
     const OAuth2TokenService::Request* request,
     const GoogleServiceAuthError& error) {
   DCHECK_EQ(request, oauth2_access_token_request_.get());
   oauth2_access_token_request_.reset();
   LOG(WARNING) << "ProfileDownloader: token request using refresh token failed:"
                << error.ToString();
   delegate_->OnProfileDownloadFailure(
       this, ProfileDownloaderDelegate::TOKEN_ERROR);
 }