Revert of [media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

media/video/capture/linux/video_capture_device_chromeos.cc

Index: media/video/capture/linux/video_capture_device_chromeos.cc
diff --git a/media/video/capture/linux/video_capture_device_chromeos.cc b/media/video/capture/linux/video_capture_device_chromeos.cc
index 5abfbffaa2521ca386149e4276aa620e7d1f25a3..4a6b501f878eadb34120272b7ac6b00f95710cbc 100644
--- a/media/video/capture/linux/video_capture_device_chromeos.cc
+++ b/media/video/capture/linux/video_capture_device_chromeos.cc
@@ -6,8 +6,7 @@
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/display_observer.h"
 #include "ui/gfx/screen.h"
@@ -25,7 +24,7 @@
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner)
       : capture_device_(capture_device),
         ui_task_runner_(ui_task_runner),
-        capture_task_runner_(base::ThreadTaskRunnerHandle::Get()) {
+        capture_task_runner_(base::MessageLoopProxy::current()) {
     ui_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&ScreenObserverDelegate::AddObserverOnUIThread, this));