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

net/proxy/mock_proxy_resolver.h

Index: net/proxy/mock_proxy_resolver.h
===================================================================
--- net/proxy/mock_proxy_resolver.h	(revision 51195)
+++ net/proxy/mock_proxy_resolver.h	(working copy)
@@ -61,17 +61,17 @@
    public:
     SetPacScriptRequest(MockAsyncProxyResolverBase* resolver,
                         const GURL& pac_url,
-                        const std::string& pac_bytes,
+                        const string16& pac_script,
                         CompletionCallback* callback)
         : resolver_(resolver),
           pac_url_(pac_url),
-          pac_bytes_(pac_bytes),
+          pac_script_(pac_script),
           callback_(callback),
           origin_loop_(MessageLoop::current()) {
     }
 
     const GURL& pac_url() const { return pac_url_; }
-    const std::string& pac_bytes() const { return pac_bytes_; }
+    const string16& pac_script() const { return pac_script_; }
 
     void CompleteNow(int rv) {
        CompletionCallback* callback = callback_;
@@ -85,7 +85,7 @@
    private:
     MockAsyncProxyResolverBase* resolver_;
     const GURL pac_url_;
-    const std::string pac_bytes_;
+    const string16 pac_script_;
     CompletionCallback* callback_;
     MessageLoop* origin_loop_;
   };
@@ -115,11 +115,11 @@
   }
 
   virtual int SetPacScript(const GURL& pac_url,
-                           const std::string& pac_bytes,
+                           const string16& pac_script,
                            CompletionCallback* callback) {
     DCHECK(!pending_set_pac_script_request_.get());
     pending_set_pac_script_request_.reset(
-        new SetPacScriptRequest(this, pac_url, pac_bytes, callback));
+        new SetPacScriptRequest(this, pac_url, pac_script, callback));
     // Finished when user calls SetPacScriptRequest::CompleteNow().
     return ERR_IO_PENDING;
   }