Remove all remaining traces of MessageLoopProxy.

chrome/browser/extensions/api/messaging/native_message_process_host.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 "chrome/browser/extensions/api/messaging/native_message_process_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 40 matching lines @@
       launcher_(std::move(launcher)),
       closed_(false),
 #if defined(OS_POSIX)
       read_file_(-1),
 #endif
       read_pending_(false),
       write_pending_(false),
       weak_factory_(this) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
-  task_runner_ = content::BrowserThread::GetMessageLoopProxyForThread(
+  task_runner_ = content::BrowserThread::GetTaskRunnerForThread(
       content::BrowserThread::IO);
 }
 
 NativeMessageProcessHost::~NativeMessageProcessHost() {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   if (process_.IsValid()) {
     // Kill the host process if necessary to make sure we don't leave zombies.
     // On OSX base::EnsureProcessTerminated() may block, so we have to post a
     // task on the blocking pool.
@@ skipping 286 matching lines @@
 
   if (!closed_) {
     closed_ = true;
     read_stream_.reset();
     write_stream_.reset();
     client_->CloseChannel(error_message);
   }
 }
 
 }  // namespace extensions