Reduce APK size by disabling WebRTC.

remoting/client/chromoting_client.cc

Index: remoting/client/chromoting_client.cc
diff --git a/remoting/client/chromoting_client.cc b/remoting/client/chromoting_client.cc
index 1f7165ab5db91f8a8a5b2f59b467e9bf7f02e8c3..3eb1dd8a0fc351ded2e4ffbd0b13d3816725f147 100644
--- a/remoting/client/chromoting_client.cc
+++ b/remoting/client/chromoting_client.cc
@@ -72,11 +72,11 @@ void ChromotingClient::Start(
   if (!connection_) {
     if (protocol_config_->webrtc_supported()) {
       DCHECK(!protocol_config_->ice_supported());
-#if defined(OS_NACL)
-      LOG(FATAL) << "WebRTC is not supported in webapp.";
-#else   // defined(OS_NACL)
+#if !defined(ENABLE_WEBRTC_REMOTING_CLIENT)
+      LOG(FATAL) << "WebRTC is not supported.";
+#else
       connection_.reset(new protocol::WebrtcConnectionToHost());
-#endif  // !defined(OS_NACL)
+#endif
     } else {
       DCHECK(protocol_config_->ice_supported());
       connection_.reset(new protocol::IceConnectionToHost());