Remove calls to deprecated MessageLoop methods on Windows and Linux.

media/gpu/vaapi_video_encode_accelerator.cc

Index: media/gpu/vaapi_video_encode_accelerator.cc
diff --git a/media/gpu/vaapi_video_encode_accelerator.cc b/media/gpu/vaapi_video_encode_accelerator.cc
index 72542bae6ef5650fa3b327e63d41d4ed8da055fa..dfb64bb018a09f19ab6b3044d9b58b850a06248e 100644
--- a/media/gpu/vaapi_video_encode_accelerator.cc
+++ b/media/gpu/vaapi_video_encode_accelerator.cc
@@ -14,6 +14,7 @@
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
 #include "base/numerics/safe_conversions.h"
+#include "base/single_thread_task_runner.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/gpu/h264_dpb.h"
 #include "media/gpu/shared_memory_region.h"
@@ -752,7 +753,7 @@ void VaapiVideoEncodeAccelerator::Destroy() {
 
   // Early-exit encoder tasks if they are running and join the thread.
   if (encoder_thread_.IsRunning()) {
-    encoder_thread_.message_loop()->PostTask(
+    encoder_thread_.task_runner()->PostTask(
         FROM_HERE, base::Bind(&VaapiVideoEncodeAccelerator::DestroyTask,
                               base::Unretained(this)));
     encoder_thread_.Stop();