Remove chromeos::GDataFileSystem::ParseGDataFeed which lacks method body

chrome/browser/chromeos/gdata/gdata_file_system.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_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 622 matching lines @@
 
   // Callback run as a response to LoadFeedFromServer.
   typedef base::Callback<void(GetDocumentsParams* params,
                               base::PlatformFileError error)>
       LoadDocumentFeedCallback;
 
   // Finds entry object by |file_path| and returns the entry object.
   // Returns NULL if it does not find the entry.
   GDataEntry* GetGDataEntryByPath(const FilePath& file_path);
 
-  // Converts document feed from gdata service into DirectoryInfo. On failure,
-  // returns NULL and fills in |error| with an appropriate value.
-  GDataDirectory* ParseGDataFeed(GDataErrorCode status,
-                                 base::Value* data,
-                                 base::PlatformFileError *error);
-
   // Callback passed to |LoadFeedFromServer| from |SearchAsync| method.
   // |callback| is that should be run with data received from
   // |LoadFeedFromServer|.
   // |params| params used for getting document feed for content search.
   // |error| error code returned by |LoadFeedFromServer|.
   void OnSearch(const ReadDirectoryCallback& callback,
                 GetDocumentsParams* params,
                 base::PlatformFileError error);
 
   // Initiates transfer of |local_file_path| with |resource_id| to
@@ skipping 876 matching lines @@
 };
 
 // Sets the free disk space getter for testing.
 // The existing getter is deleted.
 void SetFreeDiskSpaceGetterForTesting(
     FreeDiskSpaceGetterInterface* getter);
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_