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

extensions/browser/api/web_request/web_request_api.cc

 // Copyright (c) 2012 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 "extensions/browser/api/web_request/web_request_api.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 2356 matching lines @@
       }
 
       for (size_t i = 0; i < headers_value->GetSize(); ++i) {
         base::DictionaryValue* header_value = NULL;
         std::string name;
         std::string value;
         EXTENSION_FUNCTION_VALIDATE(
             headers_value->GetDictionary(i, &header_value));
         if (!FromHeaderDictionary(header_value, &name, &value)) {
           std::string serialized_header;
-          base::JSONWriter::Write(header_value, &serialized_header);
+          base::JSONWriter::Write(*header_value, &serialized_header);
           RespondWithError(event_name,
                            sub_event_name,
                            request_id,
                            response.Pass(),
                            ErrorUtils::FormatErrorMessage(keys::kInvalidHeader,
                                                           serialized_header));
           return false;
         }
         if (!net::HttpUtil::IsValidHeaderName(name)) {
           RespondWithError(event_name,
@@ skipping 71 matching lines @@
       base::Bind(&WarningService::NotifyWarningsOnUI, profile_id(), warnings));
 
   // Continue gracefully.
   RunSync();
 }
 
 bool WebRequestHandlerBehaviorChangedFunction::RunSync() {
   helpers::ClearCacheOnNavigation();
   return true;
 }