Reimplements net::AddressList without struct addrinfo.

net/spdy/spdy_session_spdy3_unittest.cc

Index: net/spdy/spdy_session_spdy3_unittest.cc
diff --git a/net/spdy/spdy_session_spdy3_unittest.cc b/net/spdy/spdy_session_spdy3_unittest.cc
index 7ac41c308048b07a8722c84e52a2bd86a30fbe3e..82b2342e794fdb8738666e5b7c4e2b237425d3f1 100644
--- a/net/spdy/spdy_session_spdy3_unittest.cc
+++ b/net/spdy/spdy_session_spdy3_unittest.cc
@@ -810,9 +810,8 @@ void IPPoolingTest(bool clean_via_close_current_sessions) {
 
   // TODO(rtenneti): MockClientSocket::GetPeerAddress return's 0 as the port
   // number. Fix it to return port 80 and then use GetPeerAddress to AddAlias.
-  const addrinfo* address = test_hosts[0].addresses.head();
   SpdySessionPoolPeer pool_peer(spdy_session_pool);
-  pool_peer.AddAlias(address, test_hosts[0].pair);
+  pool_peer.AddAlias(test_hosts[0].addresses.front(), test_hosts[0].pair);
 
   // Flush the SpdySession::OnReadComplete() task.
   MessageLoop::current()->RunAllPending();