net: Add NET_API to net/base

net/base/winsock_init.h

Index: net/base/winsock_init.h
===================================================================
--- net/base/winsock_init.h	(revision 85332)
+++ net/base/winsock_init.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 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.
 
@@ -9,10 +9,12 @@
 #define NET_BASE_WINSOCK_INIT_H_
 #pragma once
 
+#include "net/base/net_api.h"
+
 namespace net {
 
 // Make sure that Winsock is initialized, calling WSAStartup if needed.
-void EnsureWinsockInit();
+NET_API void EnsureWinsockInit();
 
 }  // namespace net