Revert of Refactoring: Merge VideoSenderConfig and AudioSenderConfig.

media/cast/sender/audio_sender.cc

Index: media/cast/sender/audio_sender.cc
diff --git a/media/cast/sender/audio_sender.cc b/media/cast/sender/audio_sender.cc
index 634afa619ec89fa09e476b9cf30367741aa3a221..12580f8c0bdae0b5fda64fa032a33b2c38076dfc 100644
--- a/media/cast/sender/audio_sender.cc
+++ b/media/cast/sender/audio_sender.cc
@@ -18,27 +18,31 @@
 namespace cast {
 
 AudioSender::AudioSender(scoped_refptr<CastEnvironment> cast_environment,
-                         const FrameSenderConfig& audio_config,
+                         const AudioSenderConfig& audio_config,
                          const StatusChangeCallback& status_change_cb,
                          CastTransport* const transport_sender)
     : FrameSender(cast_environment,
                   true,
                   transport_sender,
-                  audio_config.rtp_timebase,
-                  audio_config.sender_ssrc,
+                  audio_config.frequency,
+                  audio_config.ssrc,
                   0,  // |max_frame_rate_| is set after encoder initialization.
                   audio_config.min_playout_delay,
                   audio_config.max_playout_delay,
                   audio_config.animated_playout_delay,
-                  NewFixedCongestionControl(audio_config.max_bitrate)),
+                  NewFixedCongestionControl(audio_config.bitrate)),
       samples_in_encoder_(0),
       weak_factory_(this) {
   if (!audio_config.use_external_encoder) {
-    audio_encoder_.reset(new AudioEncoder(
-        cast_environment, audio_config.channels, audio_config.rtp_timebase,
-        audio_config.max_bitrate, audio_config.codec,
-        base::Bind(&AudioSender::OnEncodedAudioFrame,
-                   weak_factory_.GetWeakPtr(), audio_config.max_bitrate)));
+    audio_encoder_.reset(
+        new AudioEncoder(cast_environment,
+                         audio_config.channels,
+                         audio_config.frequency,
+                         audio_config.bitrate,
+                         audio_config.codec,
+                         base::Bind(&AudioSender::OnEncodedAudioFrame,
+                                    weak_factory_.GetWeakPtr(),
+                                    audio_config.bitrate)));
   }
 
   // AudioEncoder provides no operational status changes during normal use.
@@ -55,10 +59,10 @@
   // initialization parameters. Now that we have an encoder, we can calculate
   // the maximum frame rate.
   max_frame_rate_ =
-      audio_config.rtp_timebase / audio_encoder_->GetSamplesPerFrame();
+      audio_config.frequency / audio_encoder_->GetSamplesPerFrame();
 
   media::cast::CastTransportRtpConfig transport_config;
-  transport_config.ssrc = audio_config.sender_ssrc;
+  transport_config.ssrc = audio_config.ssrc;
   transport_config.feedback_ssrc = audio_config.receiver_ssrc;
   transport_config.rtp_payload_type = audio_config.rtp_payload_type;
   transport_config.aes_key = audio_config.aes_key;