net: Add NET_API to net/base

net/base/host_port_pair.h

Index: net/base/host_port_pair.h
===================================================================
--- net/base/host_port_pair.h	(revision 85332)
+++ net/base/host_port_pair.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -8,13 +8,14 @@
 
 #include <string>
 #include "base/basictypes.h"
+#include "net/base/net_api.h"
 
 struct addrinfo;
 class GURL;
 
 namespace net {
 
-class HostPortPair {
+class NET_API HostPortPair {
  public:
   HostPortPair();
   // If |in_host| represents an IPv6 address, it should not bracket the address.