Use ChannelProxy for most calls on voe::Channel in Audio[Receive|Send]Stream.

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index 0e509d2fd0c025fa9226200839fdda33a5e9dd0e..f26fdb23d46cf16beb6e65022b210ad90f334bf7 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -279,6 +279,7 @@ public:
     // VoEVideoSync
     bool GetDelayEstimate(int* jitter_buffer_delay_ms,
                           int* playout_buffer_delay_ms) const;
+    uint32_t GetDelayEstimate() const;
     int LeastRequiredDelayMs() const;
     int SetMinimumPlayoutDelay(int delayMs);
     int GetPlayoutTimestamp(unsigned int& timestamp);