gdata: Remove obsolete GDataDB related code

chrome/chrome_tests.gypi

 # 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1090 matching lines @@
         'browser/chromeos/dbus/proxy_resolution_service_provider_unittest.cc',
         'browser/chromeos/extensions/file_browser_notifications_unittest.cc',
         'browser/chromeos/external_metrics_unittest.cc',
         'browser/chromeos/gdata/drive_api_parser_unittest.cc',
         'browser/chromeos/gdata/drive_webapps_registry_unittest.cc',
         'browser/chromeos/gdata/file_write_helper_unittest.cc',
         'browser/chromeos/gdata/gdata_cache_metadata_unittest.cc',
         'browser/chromeos/gdata/gdata_cache_unittest.cc',
         'browser/chromeos/gdata/gdata_contacts_service_stub.cc',
         'browser/chromeos/gdata/gdata_contacts_service_stub.h',
-        'browser/chromeos/gdata/gdata_db_unittest.cc',
         'browser/chromeos/gdata/gdata_file_system_unittest.cc',
         'browser/chromeos/gdata/gdata_files_unittest.cc',
         'browser/chromeos/gdata/gdata_operation_registry_unittest.cc',
         'browser/chromeos/gdata/gdata_operations_unittest.cc',
         'browser/chromeos/gdata/gdata_sync_client_unittest.cc',
         'browser/chromeos/gdata/gdata_test_util.cc',
         'browser/chromeos/gdata/gdata_test_util.h',
         'browser/chromeos/gdata/gdata_util_unittest.cc',
         'browser/chromeos/gdata/gdata_wapi_parser_unittest.cc',
         'browser/chromeos/gdata/mock_directory_change_observer.cc',
@@ skipping 3541 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }