Delete deprecated and unused method VideoFrame::SetTimeStamp.

webrtc/media/base/videoframe.h

Index: webrtc/media/base/videoframe.h
diff --git a/webrtc/media/base/videoframe.h b/webrtc/media/base/videoframe.h
index a1393499f9e72742ba5792e790c09cf5fe52baf5..76a4e3b32fa99d6d2e7bb76b57dafcdce059e6f0 100644
--- a/webrtc/media/base/videoframe.h
+++ b/webrtc/media/base/videoframe.h
@@ -51,9 +51,6 @@ class VideoFrame {
   virtual int64_t GetTimeStamp() const {
     return rtc::kNumNanosecsPerMicrosec * timestamp_us();
   }
-  virtual void SetTimeStamp(int64_t time_ns) {
-    set_timestamp_us(time_ns / rtc::kNumNanosecsPerMicrosec);
-  }
 
   // Indicates the rotation angle in degrees.
   virtual webrtc::VideoRotation rotation() const = 0;