content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/child/scoped_child_process_reference.cc

 // Copyright 2013 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/child/scoped_child_process_reference.h"
 
 #include "base/bind.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "content/child/child_process.h"
 
 namespace content {
 
 ScopedChildProcessReference::ScopedChildProcessReference()
     : has_reference_(true) {
   ChildProcess::current()->AddRefProcess();
 }
 
 ScopedChildProcessReference::~ScopedChildProcessReference() {
   if (has_reference_)
     ChildProcess::current()->ReleaseProcess();
 }
 
 void ScopedChildProcessReference::ReleaseWithDelay(
     const base::TimeDelta& delay) {
   DCHECK(has_reference_);
-  base::MessageLoop::current()->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&ChildProcess::ReleaseProcess,
-                 base::Unretained(ChildProcess::current())),
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+      FROM_HERE, base::Bind(&ChildProcess::ReleaseProcess,
+                            base::Unretained(ChildProcess::current())),
       delay);
   has_reference_ = false;
 }
 
 }  // namespace content