Adding "rtp_timebase" variable in lieu of "frequency" for FrameReceiverConfig structure.

media/cast/test/cast_benchmarks.cc

Index: media/cast/test/cast_benchmarks.cc
diff --git a/media/cast/test/cast_benchmarks.cc b/media/cast/test/cast_benchmarks.cc
index a38f2be86702a0e88bb353e2a0dd27f22d0db69d..8ef123e5008912d9ed33383c7364315374f221cb 100644
--- a/media/cast/test/cast_benchmarks.cc
+++ b/media/cast/test/cast_benchmarks.cc
@@ -254,7 +254,7 @@ class RunOneBenchmark {
     audio_receiver_config_.incoming_ssrc = audio_sender_config_.ssrc;
     audio_receiver_config_.rtp_payload_type =
         audio_sender_config_.rtp_payload_type;
-    audio_receiver_config_.frequency = audio_sender_config_.frequency;
+    audio_receiver_config_.rtp_timebase = audio_sender_config_.frequency;
     audio_receiver_config_.channels = kAudioChannels;
     audio_receiver_config_.target_frame_rate = 100;
     audio_receiver_config_.codec = audio_sender_config_.codec;
@@ -290,7 +290,7 @@ class RunOneBenchmark {
     video_receiver_config_.rtp_payload_type =
         video_sender_config_.rtp_payload_type;
     video_receiver_config_.codec = video_sender_config_.codec;
-    video_receiver_config_.frequency = kVideoFrequency;
+    video_receiver_config_.rtp_timebase = kVideoFrequency;
     video_receiver_config_.channels = 1;
     video_receiver_config_.target_frame_rate = 100;
     video_receiver_config_.rtp_max_delay_ms = kTargetPlayoutDelayMs;