Break two classes defined in json_value_serializer.cc, .h into separate files.

chrome/browser/intents/cws_intents_registry.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 "chrome/browser/intents/cws_intents_registry.h"
 
 #include "base/callback.h"
-#include "base/json/json_value_serializer.h"
+#include "base/json/json_string_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/net/browser_url_util.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "content/public/common/url_fetcher.h"
 #include "net/base/mime_util.h"
 #include "net/base/load_flags.h"
@@ skipping 129 matching lines @@
 
 // static
 GURL CWSIntentsRegistry::BuildQueryURL(const string16& action,
                                        const string16& type) {
   GURL request(kCWSIntentServiceURL);
   request = chrome_browser_net::AppendQueryParameter(request, "intent",
                                                      UTF16ToUTF8(action));
   return chrome_browser_net::AppendQueryParameter(request, "mime_types",
                                                   UTF16ToUTF8(type));
 }