Refactor tcp socket and unix domain socket.

net/base/net_util.h

Index: net/base/net_util.h
diff --git a/net/base/net_util.h b/net/base/net_util.h
index d83744fb596dfae3c293a16b3288e8bd93d587e3..4ccca856097a12f9b0f818eea22d6ac745f13cb5 100644
--- a/net/base/net_util.h
+++ b/net/base/net_util.h
@@ -114,6 +114,9 @@ NET_EXPORT bool IsIPAddressReserved(const IPAddressNumber& address);
 struct SockaddrStorage {
   SockaddrStorage() : addr_len(sizeof(addr_storage)),
                       addr(reinterpret_cast<struct sockaddr*>(&addr_storage)) {}
+  SockaddrStorage(const SockaddrStorage& other);
+  void operator=(const SockaddrStorage& other);
+
   struct sockaddr_storage addr_storage;
   socklen_t addr_len;
   struct sockaddr* const addr;