Reland "Renaming AudioEncoder::SetTargetBitrate and SetProjectedPacketLossRate."

The earlier attempt of this was in
https://codereview.webrtc.org/2411613002/

It was reverted due to failures on internal bots, showing that we cannot deprecate one method.

BUG=webrtc:6303

Review-Url: https://codereview.webrtc.org/2538493006
Cr-Commit-Position: refs/heads/master@{#15333}
diff --git a/webrtc/modules/audio_coding/codecs/mock/mock_audio_encoder.h b/webrtc/modules/audio_coding/codecs/mock/mock_audio_encoder.h
index 66f82b2..e277200 100644
--- a/webrtc/modules/audio_coding/codecs/mock/mock_audio_encoder.h
+++ b/webrtc/modules/audio_coding/codecs/mock/mock_audio_encoder.h
@@ -39,10 +39,12 @@
   MOCK_METHOD1(SetDtx, bool(bool enable));
   MOCK_METHOD1(SetApplication, bool(Application application));
   MOCK_METHOD1(SetMaxPlaybackRate, void(int frequency_hz));
-  MOCK_METHOD1(SetProjectedPacketLossRate, void(double fraction));
-  MOCK_METHOD1(SetTargetBitrate, void(int target_bps));
   MOCK_METHOD1(SetMaxBitrate, void(int max_bps));
   MOCK_METHOD1(SetMaxPayloadSize, void(int max_payload_size_bytes));
+  MOCK_METHOD1(OnReceivedTargetAudioBitrate,
+               void(int target_audio_bitrate_bps));
+  MOCK_METHOD1(OnReceivedUplinkPacketLossFraction,
+               void(float uplink_packet_loss_fraction));
 
   // Note, we explicitly chose not to create a mock for the Encode method.
   MOCK_METHOD3(EncodeImpl,