Remove all remaining traces of MessageLoopProxy.

headless/lib/browser/headless_browser_context_impl.cc

 // Copyright 2015 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 "headless/lib/browser/headless_browser_context_impl.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
@@ skipping 134 matching lines @@
 content::BackgroundSyncController*
 HeadlessBrowserContextImpl::GetBackgroundSyncController() {
   return nullptr;
 }
 
 net::URLRequestContextGetter* HeadlessBrowserContextImpl::CreateRequestContext(
     content::ProtocolHandlerMap* protocol_handlers,
     content::URLRequestInterceptorScopedVector request_interceptors) {
   scoped_refptr<HeadlessURLRequestContextGetter> url_request_context_getter(
       new HeadlessURLRequestContextGetter(
-          content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::GetTaskRunnerForThread(
               content::BrowserThread::IO),
-          content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::GetTaskRunnerForThread(
               content::BrowserThread::FILE),
           protocol_handlers, std::move(protocol_handlers_),
           std::move(request_interceptors), options()));
   resource_context_->set_url_request_context_getter(url_request_context_getter);
   return url_request_context_getter.get();
 }
 
 net::URLRequestContextGetter*
 HeadlessBrowserContextImpl::CreateRequestContextForStoragePartition(
     const base::FilePath& partition_path,
@@ skipping 34 matching lines @@
   return *this;
 }
 
 std::unique_ptr<HeadlessBrowserContext>
 HeadlessBrowserContext::Builder::Build() {
   return base::WrapUnique(new HeadlessBrowserContextImpl(
       std::move(protocol_handlers_), browser_->options()));
 }
 
 }  // namespace headless