Remove VideoDecoderConfig.frame_rate_xxx() & VideoFrame:Get/SetDuration()

media/filters/video_frame_generator.cc

Index: media/filters/video_frame_generator.cc
diff --git a/media/filters/video_frame_generator.cc b/media/filters/video_frame_generator.cc
index c901b9ea65107a82337d4cb46965760276c33535..b8819d459d5c0c79c81162235a9fdef6389ae678 100644
--- a/media/filters/video_frame_generator.cc
+++ b/media/filters/video_frame_generator.cc
@@ -79,8 +79,7 @@ void VideoFrameGenerator::ReadOnDecoderThread(const ReadCB& read_cb) {
       VideoFrame::CreateFrame(VideoFrame::YV12,
                               natural_size_.width(),
                               natural_size_.height(),
-                              current_time_,
-                              frame_duration_);
+                              current_time_);
   current_time_ += frame_duration_;
 
   // TODO(wjia): set pixel data to pre-defined patterns if it's desired to