Revert of [media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

media/cdm/default_cdm_factory.cc

Index: media/cdm/default_cdm_factory.cc
diff --git a/media/cdm/default_cdm_factory.cc b/media/cdm/default_cdm_factory.cc
index 4132a24b96952fe62eeee694d48bf568875cdce3..202f3cdcf21d643c2c4c400e85a70f3119e801f3 100644
--- a/media/cdm/default_cdm_factory.cc
+++ b/media/cdm/default_cdm_factory.cc
@@ -7,8 +7,7 @@
 #include "base/bind.h"
 #include "base/bind_helpers.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/base/key_systems.h"
 #include "media/cdm/aes_decryptor.h"
 #include "url/gurl.h"
@@ -33,7 +32,7 @@
     const SessionExpirationUpdateCB& session_expiration_update_cb,
     const CdmCreatedCB& cdm_created_cb) {
   if (!security_origin.is_valid() || !CanUseAesDecryptor(key_system)) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
+    base::MessageLoopProxy::current()->PostTask(
         FROM_HERE, base::Bind(cdm_created_cb, nullptr));
     return;
   }
@@ -41,7 +40,7 @@
   scoped_ptr<MediaKeys> cdm(
       new AesDecryptor(security_origin, session_message_cb, session_closed_cb,
                        session_keys_change_cb));
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  base::MessageLoopProxy::current()->PostTask(
       FROM_HERE, base::Bind(cdm_created_cb, base::Passed(&cdm)));
 }