Revert of [media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

media/filters/default_media_permission.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 "media/filters/default_media_permission.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
-#include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
+#include "base/message_loop/message_loop_proxy.h"
 
 namespace media {
 
 DefaultMediaPermission::DefaultMediaPermission(bool allow) : allow_(allow) {
 }
 
 DefaultMediaPermission::~DefaultMediaPermission() {
 }
 
 static void FirePermissionStatusCallback(
     const MediaPermission::PermissionStatusCB& permission_status_cb,
     bool allow) {
   LOG(WARNING) << (allow ? "Allowing" : "Denying")
                << "media permission request with a default value instead of "
                   "real user's consent. This should NOT be used for in a real "
                   "user-facing product.";
   // Return the callback asynchronously.
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  base::MessageLoopProxy::current()->PostTask(
       FROM_HERE, base::Bind(permission_status_cb, allow));
 }
 
 void DefaultMediaPermission::HasPermission(
     Type type,
     const GURL& /* security_origin */,
     const PermissionStatusCB& permission_status_cb) {
   CHECK_EQ(PROTECTED_MEDIA_IDENTIFIER, type);
   FirePermissionStatusCallback(permission_status_cb, allow_);
 }
 
 void DefaultMediaPermission::RequestPermission(
     Type type,
     const GURL& /* security_origin */,
     const PermissionStatusCB& permission_status_cb) {
   CHECK_EQ(PROTECTED_MEDIA_IDENTIFIER, type);
   FirePermissionStatusCallback(permission_status_cb, allow_);
 }
 
 }  // namespace media