Remove all remaining traces of MessageLoopProxy.

extensions/shell/browser/shell_browser_context.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 "extensions/shell/browser/shell_browser_context.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "components/guest_view/browser/guest_view_manager.h"
@@ skipping 50 matching lines @@
   InfoMap* extension_info_map =
       browser_main_parts_->extension_system()->info_map();
   (*protocol_handlers)[kExtensionScheme] =
       linked_ptr<net::URLRequestJobFactory::ProtocolHandler>(
           CreateExtensionProtocolHandler(false /* is_incognito */,
                                          extension_info_map)
               .release());
 
   set_url_request_context_getter(new ShellURLRequestContextGetter(
       this, IgnoreCertificateErrors(), GetPath(),
-      content::BrowserThread::GetMessageLoopProxyForThread(
+      content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::IO),
-      content::BrowserThread::GetMessageLoopProxyForThread(
+      content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::FILE),
       protocol_handlers, std::move(request_interceptors), nullptr /* net_log */,
       extension_info_map));
   resource_context_->set_url_request_context_getter(
       url_request_context_getter());
   content::BrowserThread::PostTask(
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(
           &ShellBrowserContext::InitURLRequestContextOnIOThread,
           base::Unretained(this)));
   return url_request_context_getter();
 }
 
 void ShellBrowserContext::InitURLRequestContextOnIOThread() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   // GetURLRequestContext() will create a URLRequestContext if it isn't
   // initialized.
   url_request_context_getter()->GetURLRequestContext();
 }
 
 }  // namespace extensions