Fix "IsLoopbackIp" to cover all loopback addresses; not just 127.0.0.1.

webrtc/base/ipaddress.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 276 matching lines @@
       return ip == IPAddress(in6addr_any) || ip == IPAddress(kV4MappedPrefix);
     case AF_UNSPEC:
       return false;
   }
   return false;
 }
 
 bool IPIsLoopback(const IPAddress& ip) {
   switch (ip.family()) {
     case AF_INET: {
-      return ip == IPAddress(INADDR_LOOPBACK);
+      return (ip.v4AddressAsHostOrderInteger() >> 24) == 127;
     }
     case AF_INET6: {
       return ip == IPAddress(in6addr_loopback);
     }
   }
   return false;
 }
 
 bool IPIsPrivate(const IPAddress& ip) {
   switch (ip.family()) {
@@ skipping 210 matching lines @@
   if (family == AF_INET) {
     return rtc::IPAddress(INADDR_ANY);
   }
   if (family == AF_INET6) {
     return rtc::IPAddress(in6addr_any);
   }
   return rtc::IPAddress();
 }
 
 }  // namespace rtc