Bind a socket to a network if the network handle is set.

webrtc/base/macasyncsocket.cc

Index: webrtc/base/macasyncsocket.cc
diff --git a/webrtc/base/macasyncsocket.cc b/webrtc/base/macasyncsocket.cc
index 8f811ea8b668ed5d8bbab7acc51a61f18cd1feed..179db7fef46399901e2f872acbfdbb4778c9a036 100644
--- a/webrtc/base/macasyncsocket.cc
+++ b/webrtc/base/macasyncsocket.cc
@@ -276,6 +276,11 @@ int MacAsyncSocket::Close() {
   return 0;
 }
 
+int MacAsyncSocket::BindToNetwork(NetworkHandle handle) {
+  ASSERT(false && "NYI");
+  return 0;
+}
+
 int MacAsyncSocket::EstimateMTU(uint16_t* mtu) {
   ASSERT(false && "NYI");
   return -1;