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

net/proxy/proxy_resolver_mac.h

 // Copyright (c) 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_MAC_H_
 #define NET_PROXY_PROXY_RESOLVER_MAC_H_
 
 #include <string>
 
 #include "googleurl/src/gurl.h"
@@ skipping 14 matching lines @@
                              CompletionCallback* callback,
                              RequestHandle* request,
                              const BoundNetLog& net_log);
 
   virtual void CancelRequest(RequestHandle request) {
     NOTREACHED();
   }
 
  private:
   virtual int SetPacScript(const GURL& pac_url,
-                           const std::string& /*pac_bytes*/,
+                           const string16& /*pac_script*/,
                            CompletionCallback* /*callback*/) {
     pac_url_ = pac_url;
     return OK;
   }
 
   GURL pac_url_;
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_MAC_H_