Reduce the copying of string data between C++ and javascript in proxy_resolver_v8.cc.

net/proxy/proxy_resolver_winhttp.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef NET_PROXY_PROXY_RESOLVER_WINHTTP_H_
 #define NET_PROXY_PROXY_RESOLVER_WINHTTP_H_
 
 #include <string>
 
 #include "googleurl/src/gurl.h"
@@ skipping 14 matching lines @@
   virtual int GetProxyForURL(const GURL& url,
                              ProxyInfo* results,
                              CompletionCallback* /*callback*/,
                              RequestHandle* /*request*/,
                              const BoundNetLog& /*net_log*/);
   virtual void CancelRequest(RequestHandle request);
 
  private:
   // ProxyResolver implementation:
   virtual int SetPacScript(const GURL& pac_url,
-                           const std::string& /*pac_bytes*/,
+                           const string16& /*pac_script*/,
                            CompletionCallback* /*callback*/);
   bool OpenWinHttpSession();
   void CloseWinHttpSession();
 
   // Proxy configuration is cached on the session handle.
   HINTERNET session_handle_;
 
   GURL pac_url_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyResolverWinHttp);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_WINHTTP_H_