Fix race conditions in ImageDecoder.

chrome/browser/chromeos/login/supervised/supervised_user_creation_screen.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/chromeos/login/supervised/supervised_user_creation_screen.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
 #include "base/rand_util.h"
 #include "base/values.h"
@@ skipping 82 matching lines @@
 SupervisedUserCreationScreen* SupervisedUserCreationScreen::Get(
     ScreenManager* manager) {
   return static_cast<SupervisedUserCreationScreen*>(
       manager->GetScreen(WizardController::kSupervisedUserCreationScreenName));
 }
 
 SupervisedUserCreationScreen::SupervisedUserCreationScreen(
     BaseScreenDelegate* base_screen_delegate,
     SupervisedUserCreationScreenHandler* actor)
     : BaseScreen(base_screen_delegate),
-      ImageRequest(content::BrowserThread::GetMessageLoopProxyForThread(
-          content::BrowserThread::UI)),
       actor_(actor),
       on_error_screen_(false),
       manager_signin_in_progress_(false),
       last_page_(kNameOfIntroScreen),
       sync_service_(NULL),
       apply_photo_after_decoding_(false),
       selected_image_(0),
       histogram_helper_(new ErrorScreensHistogramHelper("Supervised")),
       weak_factory_(this) {
   DCHECK(actor_);
@@ skipping 504 matching lines @@
     selected_image_ = user_manager::User::USER_IMAGE_EXTERNAL;
   } else {
     NOTREACHED() << "Unexpected image type: " << image_type;
   }
 }
 
 void SupervisedUserCreationScreen::OnImageAccepted() {
 }
 
 }  // namespace chromeos