gdata: Remove obsolete GDataDB related code

chrome/browser/chromeos/gdata/gdata_files.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_FILES_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_
 
 #include <map>
 #include <string>
 
@@ skipping 71 matching lines @@
   const GDataFile* AsGDataFileConst() const;
   const GDataDirectory* AsGDataDirectoryConst() const;
 
   // Converts DocumentEntry into GDataEntry.
   static GDataEntry* FromDocumentEntry(
       GDataDirectory* parent,
       DocumentEntry* doc,
       GDataDirectoryService* directory_service);
 
   // Serialize/Parse to/from string via proto classes.
-  // TODO(achuith): Correctly set up parent_ and root_ links in
-  // FromProtoString.
   void SerializeToString(std::string* serialized_proto) const;
-  static scoped_ptr<GDataEntry> FromProtoString(
-      const std::string& serialized_proto);
 
   // Converts the proto representation to the platform file.
   static void ConvertProtoToPlatformFileInfo(
       const PlatformFileInfoProto& proto,
       base::PlatformFileInfo* file_info);
 
   // Converts the platform file info to the proto representation.
   static void ConvertPlatformFileInfoToProto(
       const base::PlatformFileInfo& file_info,
       PlatformFileInfoProto* proto);
@@ skipping 309 matching lines @@
   size_t serialized_size_;
   int largest_changestamp_;  // Stored in the serialized proto.
   ContentOrigin origin_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataDirectoryService);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_