Add NetworkAdaptor to dart:io.

runtime/bin/dbg_connection.cc

Index: runtime/bin/dbg_connection.cc
diff --git a/runtime/bin/dbg_connection.cc b/runtime/bin/dbg_connection.cc
index 1d722b9212d9927073b0fb1ecc66b9b8e2c2f6e7..db77a1682dfd1c1f64650e5e68d454179c0b450b 100644
--- a/runtime/bin/dbg_connection.cc
+++ b/runtime/bin/dbg_connection.cc
@@ -300,9 +300,11 @@ int DebuggerConnectionHandler::StartHandler(const char* address,
   // debugger commands received on these connections.
   ASSERT(listener_fd_ == -1);
   OSError *os_error;
-  SocketAddresses* addresses = Socket::LookupAddress(address, -1, &os_error);
+  AddressList<SocketAddress>* addresses =
+      Socket::LookupAddress(address, -1, &os_error);
   listener_fd_ = ServerSocket::CreateBindListen(
       addresses->GetAt(0)->addr(), port_number, 1);
+  delete addresses;
   port_number = Socket::GetPort(listener_fd_);
   DebuggerConnectionImpl::StartHandler(port_number);
   return port_number;