Remove deprecated base::NonThreadSafe in media/cast.

media/cast/sender/video_sender.h

Index: media/cast/sender/video_sender.h
diff --git a/media/cast/sender/video_sender.h b/media/cast/sender/video_sender.h
index e383faa2509a75da1af55a6df91eecaf171e15e3..910e155cd5da00f97dd236d528c575c41a36a77c 100644
--- a/media/cast/sender/video_sender.h
+++ b/media/cast/sender/video_sender.h
@@ -11,7 +11,6 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "media/cast/cast_config.h"
@@ -38,7 +37,7 @@ typedef base::Callback<void(base::TimeDelta)> PlayoutDelayChangeCB;
 // RTCP packets.
 // Additionally it posts a bunch of delayed tasks to the main thread for various
 // timeouts.
-class VideoSender : public FrameSender, public base::NonThreadSafe {
+class VideoSender : public FrameSender {
  public:
   VideoSender(scoped_refptr<CastEnvironment> cast_environment,
               const FrameSenderConfig& video_config,