Unify newapi::RtcpMode and RTCPMethod.

webrtc/common_types.h

Index: webrtc/common_types.h
diff --git a/webrtc/common_types.h b/webrtc/common_types.h
index 9b730a13cbbea99b163a86681345339b62e56bac..c11c4d7a734c3fe7bd57e693a11cf030af0b764d 100644
--- a/webrtc/common_types.h
+++ b/webrtc/common_types.h
@@ -893,6 +893,11 @@ class StreamDataCountersCallback {
   virtual void DataCountersUpdated(const StreamDataCounters& counters,
                                    uint32_t ssrc) = 0;
 };
+
+// RTCP mode to use. Compound mode is described by RFC 4585 and reduced-size
+// RTCP mode is described by RFC 5506.
+enum class RtcpMode { kOff, kCompound, kReducedSize };
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_TYPES_H_