Revert "GetDefaultLocalAddress should return false when the address is invalid"

webrtc/p2p/base/stunport.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 398 matching lines @@
 
 bool UDPPort::MaybeSetDefaultLocalAddress(rtc::SocketAddress* addr) const {
   if (!addr->IsAnyIP() || !emit_local_for_anyaddress_ ||
       !Network()->default_local_address_provider()) {
     return true;
   }
   rtc::IPAddress default_address;
   bool result =
       Network()->default_local_address_provider()->GetDefaultLocalAddress(
           addr->family(), &default_address);
-  if (!result) {
+  if (!result || default_address.IsNil()) {
     return false;
   }
 
-  RTC_DCHECK(!default_address.IsNil())
-
   addr->SetIP(default_address);
   return true;
 }
 
 void UDPPort::OnStunBindingRequestSucceeded(
     const rtc::SocketAddress& stun_server_addr,
     const rtc::SocketAddress& stun_reflected_addr) {
   if (bind_request_succeeded_servers_.find(stun_server_addr) !=
           bind_request_succeeded_servers_.end()) {
     return;
@@ skipping 71 matching lines @@
   const std::vector<Candidate>& existing_candidates = Candidates();
   std::vector<Candidate>::const_iterator it = existing_candidates.begin();
   for (; it != existing_candidates.end(); ++it) {
     if (it->address() == addr)
       return true;
   }
   return false;
 }
 
 }  // namespace cricket