Revert of [media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

media/blink/webcontentdecryptionmoduleaccess_impl.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 "media/blink/webcontentdecryptionmoduleaccess_impl.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/message_loop/message_loop_proxy.h"
 #include "media/blink/webencryptedmediaclient_impl.h"
 
 namespace media {
 
 // The caller owns the created cdm (passed back using |result|).
 static void CreateCdm(const base::WeakPtr<WebEncryptedMediaClientImpl>& client,
                       const blink::WebString& key_system,
                       bool allow_distinctive_identifier,
                       bool allow_persistent_state,
                       const blink::WebSecurityOrigin& security_origin,
@@ skipping 52 matching lines @@
       (configuration_.distinctiveIdentifier ==
        blink::WebMediaKeySystemConfiguration::Requirement::Required);
   bool allow_persistent_state =
       (configuration_.persistentState ==
        blink::WebMediaKeySystemConfiguration::Requirement::Required);
 
   // This method needs to run asynchronously, as it may need to load the CDM.
   // As this object's lifetime is controlled by MediaKeySystemAccess on the
   // blink side, copy all values needed by CreateCdm() in case the blink object
   // gets garbage-collected.
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
       base::Bind(&CreateCdm, client_, key_system_, allow_distinctive_identifier,
                  allow_persistent_state, security_origin_, result));
 }
 
 }  // namespace media