Convert JsonWriter::Write to taking a const ref for the in-param

chrome/renderer/net/net_error_helper.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/renderer/net/net_error_helper.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
@@ skipping 212 matching lines @@
                              error.unreachableURL,
                              is_failed_post,
                              error.staleCopyInCache,
                              RenderThread::Get()->GetLocale(),
                              render_frame()->GetRenderView()->
                                  GetAcceptLanguages(),
                              scoped_ptr<ErrorPageParams>(),
                              &error_strings);
 
   std::string json;
-  JSONWriter::Write(&error_strings, &json);
+  JSONWriter::Write(error_strings, &json);
 
   std::string js = "if (window.updateForDnsProbe) "
                    "updateForDnsProbe(" + json + ");";
   base::string16 js16;
   if (!base::UTF8ToUTF16(js.c_str(), js.length(), &js16)) {
     NOTREACHED();
     return;
   }
 
   render_frame()->ExecuteJavaScript(js16);
@@ skipping 98 matching lines @@
       success ? data : "",
       render_frame()->GetRenderView()->GetAcceptLanguages(),
       base::i18n::IsRTL());
 }
 
 void NetErrorHelper::OnTrackingRequestComplete(
     const blink::WebURLResponse& response,
     const std::string& data) {
   tracking_fetcher_.reset();
 }