Remove use of deprecated MessageLoop methods in extensions.

extensions/browser/serial_extension_host_queue.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 "extensions/browser/serial_extension_host_queue.h"
 
 #include "base/bind.h"
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "components/variations/variations_associated_data.h"
 #include "extensions/browser/deferred_start_render_host.h"
 
 namespace extensions {
 
 namespace {
 
 // Gets the number of milliseconds to delay between loading ExtensionHosts. By
 // default this is 0, but it can be overridden by field trials.
@@ skipping 34 matching lines @@
 
 void SerialExtensionHostQueue::Remove(DeferredStartRenderHost* host) {
   std::list<DeferredStartRenderHost*>::iterator it =
       std::find(queue_.begin(), queue_.end(), host);
   if (it != queue_.end())
     queue_.erase(it);
 }
 
 void SerialExtensionHostQueue::PostTask() {
   if (!pending_create_) {
-    base::MessageLoop::current()->PostDelayedTask(
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, base::Bind(&SerialExtensionHostQueue::ProcessOneHost,
                               ptr_factory_.GetWeakPtr()),
         base::TimeDelta::FromMilliseconds(GetDelayMs()));
     pending_create_ = true;
   }
 }
 
 void SerialExtensionHostQueue::ProcessOneHost() {
   pending_create_ = false;
   if (queue_.empty())
     return;  // can happen on shutdown
 
   queue_.front()->CreateRenderViewNow();
   queue_.pop_front();
 
   if (!queue_.empty())
     PostTask();
 }
 
 }  // namespace extensions