Remove all remaining traces of MessageLoopProxy.

chrome/browser/extensions/api/image_writer_private/write_from_url_operation.cc

 // Copyright 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 "base/files/file_util.h"
 #include "chrome/browser/extensions/api/image_writer_private/error_messages.h"
 #include "chrome/browser/extensions/api/image_writer_private/operation_manager.h"
 #include "chrome/browser/extensions/api/image_writer_private/write_from_url_operation.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/url_request/url_fetcher.h"
@@ skipping 70 matching lines @@
   download_continuation_ = continuation;
 
   SetStage(image_writer_api::STAGE_DOWNLOAD);
 
   // Store the URL fetcher on this object so that it is destroyed before this
   // object is.
   url_fetcher_ = net::URLFetcher::Create(url_, net::URLFetcher::GET, this);
 
   url_fetcher_->SetRequestContext(request_context_);
   url_fetcher_->SaveResponseToFileAtPath(
-      image_path_,
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
+      image_path_, BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE));
 
   AddCleanUpFunction(
       base::Bind(&WriteFromUrlOperation::DestroyUrlFetcher, this));
 
   url_fetcher_->Start();
 }
 
 void WriteFromUrlOperation::DestroyUrlFetcher() { url_fetcher_.reset(); }
 
 void WriteFromUrlOperation::OnURLFetchUploadProgress(
@@ skipping 79 matching lines @@
   if (IsCancelled()) {
     return;
   }
 
   SetProgress(kProgressComplete);
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, continuation);
 }
 
 } // namespace image_writer
 } // namespace extensions