Move fake_audio_device to its own target.

webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc

Index: webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
diff --git a/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc b/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
index 25ff98d7f2239763000ef1810387205970279f7f..96379283b1032979235ce9079b532178e7ac3077 100644
--- a/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
+++ b/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
@@ -56,7 +56,7 @@ class TestRtpFeedback : public NullRtpFeedback {
   explicit TestRtpFeedback(RtpRtcp* rtp_rtcp) : rtp_rtcp_(rtp_rtcp) {}
   virtual ~TestRtpFeedback() {}
 
-  void OnIncomingSSRCChanged(const uint32_t ssrc) override {
+  void OnIncomingSSRCChanged(uint32_t ssrc) override {
     rtp_rtcp_->SetRemoteSSRC(ssrc);
   }