Build WebRTC with data channel only.

webrtc/pc/peerconnection.cc

Index: webrtc/pc/peerconnection.cc
diff --git a/webrtc/pc/peerconnection.cc b/webrtc/pc/peerconnection.cc
index 65203fdc731f1ef8e861e3971800d811fa2c61cc..c461b79757d905d6a408b2f9355d582ba687eca7 100644
--- a/webrtc/pc/peerconnection.cc
+++ b/webrtc/pc/peerconnection.cc
@@ -398,10 +398,15 @@ PeerConnection::PeerConnection(PeerConnectionFactory* factory)
       signaling_state_(kStable),
       ice_connection_state_(kIceConnectionNew),
       ice_gathering_state_(kIceGatheringNew),
+#if defined(HAVE_WEBRTC_VOICE) && defined(HAVE_WEBRTC_VIDEO)
       event_log_(RtcEventLog::Create()),
+#else
+      event_log_(std::unique_ptr<RtcEventLog>(new RtcEventLogNullImpl())),
+#endif
       rtcp_cname_(GenerateRtcpCname()),
       local_streams_(StreamCollection::Create()),
-      remote_streams_(StreamCollection::Create()) {}
+      remote_streams_(StreamCollection::Create()) {
+}
 
 PeerConnection::~PeerConnection() {
   TRACE_EVENT0("webrtc", "PeerConnection::~PeerConnection");
@@ -2326,6 +2331,7 @@ void PeerConnection::StopRtcEventLog_w() {
 }
 
 void PeerConnection::CreateCall_w() {
+#if defined(HAVE_WEBRTC_VOICE) && defined(HAVE_WEBRTC_VIDEO)
   RTC_DCHECK(!call_);
 
   const int kMinBandwidthBps = 30000;
@@ -2340,6 +2346,7 @@ void PeerConnection::CreateCall_w() {
   call_config.bitrate_config.max_bitrate_bps = kMaxBandwidthBps;
 
   call_.reset(webrtc::Call::Create(call_config));
+#endif
 }
 
 }  // namespace webrtc