Deleted unused method EstimateMTU, and the WinPing class.

webrtc/base/asyncsocket.cc

Index: webrtc/base/asyncsocket.cc
diff --git a/webrtc/base/asyncsocket.cc b/webrtc/base/asyncsocket.cc
index 6c41596499f64e76b62699b8eb12518a79e9a208..c593c4fb2cf0568a13a0b74f9956b66038780795 100644
--- a/webrtc/base/asyncsocket.cc
+++ b/webrtc/base/asyncsocket.cc
@@ -100,10 +100,6 @@ AsyncSocket::ConnState AsyncSocketAdapter::GetState() const {
   return socket_->GetState();
 }
 
-int AsyncSocketAdapter::EstimateMTU(uint16_t* mtu) {
-  return socket_->EstimateMTU(mtu);
-}
-
 int AsyncSocketAdapter::GetOption(Option opt, int* value) {
   return socket_->GetOption(opt, value);
 }