Use Drive v2 API: enable behind --enable-drive-api flag

chrome/browser/chromeos/gdata/gdata_parser.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_PARSER_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_PARSER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 658 matching lines @@
   }
 
   int largest_changestamp() const {
     return largest_changestamp_;
   }
 
   const ScopedVector<InstalledApp>& installed_apps() const {
     return installed_apps_;
   }
 
-  // Registers the mapping between JSON field names and the members in
-  // this class.
-  static void RegisterJSONConverter(
-      base::JSONValueConverter<AccountMetadataFeed>* converter);
-
- private:
+ protected:
   AccountMetadataFeed();
 
-  // Parses and initializes data members from content of |value|.
-  // Return false if parsing fails.
-  bool Parse(const base::Value& value);
-
   int64 quota_bytes_total_;
   int64 quota_bytes_used_;
   int largest_changestamp_;
   ScopedVector<InstalledApp> installed_apps_;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(AccountMetadataFeed);
 };
 
-
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_PARSER_H_