Replace MessageLoop::current()->task_runner() with ThreadTaskRunnerHandle::Get().

chrome/browser/ui/ash/media_delegate_chromeos.cc

Index: chrome/browser/ui/ash/media_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/media_delegate_chromeos.cc b/chrome/browser/ui/ash/media_delegate_chromeos.cc
index 1c37e97029152785bbe39fdd7d4355bbcf2db631..eb98064c733761bd75e37eba4765534850c1378a 100644
--- a/chrome/browser/ui/ash/media_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/media_delegate_chromeos.cc
@@ -8,8 +8,10 @@
 #include "ash/common/wm_shell.h"
 #include "ash/content/shell_content_state.h"
 #include "base/location.h"
+#include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/chromeos/extensions/media_player_api.h"
 #include "chrome/browser/chromeos/extensions/media_player_event_router.h"
 #include "chrome/browser/media/webrtc/media_stream_capture_indicator.h"
@@ -156,7 +158,8 @@ void MediaDelegateChromeOS::OnRequestUpdate(
     int render_frame_id,
     content::MediaStreamType stream_type,
     const content::MediaRequestState state) {
-  base::MessageLoopForUI::current()->task_runner()->PostTask(
+  DCHECK(base::MessageLoopForUI::IsCurrent());
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(&MediaDelegateChromeOS::NotifyMediaCaptureChange,
                             weak_ptr_factory_.GetWeakPtr()));
 }