Start ICE connectivity checks as soon as the first pair is pingable.

webrtc/p2p/base/transportchannelimpl.h

Index: webrtc/p2p/base/transportchannelimpl.h
diff --git a/webrtc/p2p/base/transportchannelimpl.h b/webrtc/p2p/base/transportchannelimpl.h
index 70cb4e292f615fbba1d91316139c1649a6d9574f..59065a10a8258d93e1416588ff38f187036e2441 100644
--- a/webrtc/p2p/base/transportchannelimpl.h
+++ b/webrtc/p2p/base/transportchannelimpl.h
@@ -46,7 +46,7 @@ class TransportChannelImpl : public TransportChannel {
   virtual void SetIceProtocolType(IceProtocolType type) {}
   // SetIceCredentials only need to be implemented by the ICE
   // transport channels. Non-ICE transport channels can just ignore.
-  // The ufrag and pwd should be set before the Connect() is called.
+  // The ufrag and pwd must be set before candidate gathering can start.
   virtual void SetIceCredentials(const std::string& ice_ufrag,
                                  const std::string& ice_pwd)  = 0;
   // SetRemoteIceCredentials only need to be implemented by the ICE
@@ -59,9 +59,6 @@ class TransportChannelImpl : public TransportChannel {
 
   virtual void SetIceConfig(const IceConfig& config) = 0;
 
-  // Begins the process of attempting to make a connection to the other client.
-  virtual void Connect() = 0;
-
   // Start gathering candidates if not already started, or if an ICE restart
   // occurred.
   virtual void MaybeStartGathering() = 0;