Remove all remaining traces of MessageLoopProxy.

content/browser/fileapi/browser_file_system_helper.cc

 // Copyright (c) 2012 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 "content/browser/fileapi/browser_file_system_helper.h"
 
 #include <stddef.h>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 58 matching lines @@
       &additional_backends);
 
   // Set up the auto mount handlers for url requests.
   std::vector<storage::URLRequestAutoMountHandler>
       url_request_auto_mount_handlers;
   GetContentClient()->browser()->GetURLRequestAutoMountHandlers(
       &url_request_auto_mount_handlers);
 
   scoped_refptr<storage::FileSystemContext> file_system_context =
       new storage::FileSystemContext(
-          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get(),
+          BrowserThread::GetTaskRunnerForThread(BrowserThread::IO).get(),
           file_task_runner.get(),
           BrowserContext::GetMountPoints(browser_context),
           browser_context->GetSpecialStoragePolicy(), quota_manager_proxy,
           std::move(additional_backends), url_request_auto_mount_handlers,
           profile_path, CreateBrowserFileSystemOptions(is_incognito));
 
   std::vector<storage::FileSystemType> types;
   file_system_context->GetFileSystemTypes(&types);
   for (size_t i = 0; i < types.size(); ++i) {
     ChildProcessSecurityPolicyImpl::GetInstance()
@@ skipping 36 matching lines @@
   context->operation_runner()->SyncGetPlatformPath(url, platform_path);
 
   // The path is to be attached to URLLoader so we grant read permission
   // for the file. (We need to check first because a parent directory may
   // already have the permissions and we don't need to grant it to the file.)
   if (!policy->CanReadFile(process_id, *platform_path))
     policy->GrantReadFile(process_id, *platform_path);
 }
 
 }  // namespace content