Fix race conditions in ImageDecoder.

chrome/browser/ui/webui/options/chromeos/change_picture_options_handler.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/ui/webui/options/chromeos/change_picture_options_handler.h"
 
 #include "ash/audio/sounds.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
@@ skipping 59 matching lines @@
 
   return file_type_info;
 }
 
 // Time histogram suffix for profile image download.
 const char kProfileDownloadReason[] = "Preferences";
 
 }  // namespace
 
 ChangePictureOptionsHandler::ChangePictureOptionsHandler()
-    : ImageRequest(
-          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI)),
-      previous_image_url_(url::kAboutBlankURL),
+    : previous_image_url_(url::kAboutBlankURL),
       previous_image_index_(user_manager::User::USER_IMAGE_INVALID) {
   registrar_.Add(this, chrome::NOTIFICATION_PROFILE_IMAGE_UPDATED,
       content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_PROFILE_IMAGE_UPDATE_FAILED,
       content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_IMAGE_CHANGED,
       content::NotificationService::AllSources());
 
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   media::SoundsManager* manager = media::SoundsManager::Get();
@@ skipping 372 matching lines @@
   Profile* profile = Profile::FromWebUI(web_ui());
   const user_manager::User* user =
       ProfileHelper::Get()->GetUserByProfile(profile);
   if (!user)
     return user_manager::UserManager::Get()->GetActiveUser();
   return user;
 }
 
 }  // namespace options
 }  // namespace chromeos