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

chrome/browser/extensions/extension_ui_unittest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 "base/json/json_value_serializer.h"
+#include "base/json/json_file_value_serializer.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "chrome/browser/ui/webui/options/extension_settings_handler.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
   static DictionaryValue* DeserializeJSONTestData(const FilePath& path,
       std::string *error) {
@@ skipping 207 matching lines @@
   scoped_ptr<DictionaryValue> extension_details(
       CreateExtensionDetailViewFromPath(
           extension_path, pages, Extension::LOAD));
 
   FilePath::StringType ui_path;
 
   EXPECT_TRUE(extension_details->GetString("path", &ui_path));
   EXPECT_EQ(extension_path, FilePath(ui_path));
 }