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

webrtc/base/ipaddress.cc

Index: webrtc/base/ipaddress.cc
diff --git a/webrtc/base/ipaddress.cc b/webrtc/base/ipaddress.cc
index b1d1265ae479ee4c97f106d2a52fabb0614ca897..c06a1a7b050a5a21efe45071c5f86a036da1de18 100644
--- a/webrtc/base/ipaddress.cc
+++ b/webrtc/base/ipaddress.cc
@@ -294,7 +294,7 @@ bool IPIsAny(const IPAddress& ip) {
 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);