Remove some dead code.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 857 matching lines @@
         'browser/managed_mode/managed_mode_unittest.cc',
         'browser/managed_mode/managed_mode_url_filter_unittest.cc',
         'browser/managed_mode/managed_user_passphrase_unittest.cc',
         'browser/managed_mode/managed_user_service_unittest.cc',
         'browser/media_gallery/linux/mtp_device_object_enumerator_unittest.cc',
         'browser/media_gallery/mac/mtp_device_delegate_impl_mac_unittest.mm',
         'browser/media_gallery/media_file_system_registry_unittest.cc',
         'browser/media_gallery/media_galleries_dialog_controller_mock.cc',
         'browser/media_gallery/media_galleries_dialog_controller_mock.h',
         'browser/media_gallery/media_galleries_preferences_unittest.cc',
-        'browser/media_gallery/media_gallery_database_unittest.cc',
         'browser/media_gallery/win/mtp_device_object_enumerator_unittest.cc',
         'browser/metrics/metrics_log_unittest.cc',
         'browser/metrics/metrics_log_serializer_unittest.cc',
         'browser/metrics/metrics_service_unittest.cc',
         'browser/metrics/thread_watcher_unittest.cc',
         'browser/metrics/variations/network_time_tracker_unittest.cc',
         'browser/metrics/variations/variations_registry_syncer_unittest_win.cc',
         'browser/metrics/variations/variations_service_unittest.cc',
         'browser/metrics/variations/resource_request_allowed_notifier_test_util.cc',
         'browser/metrics/variations/resource_request_allowed_notifier_test_util.h',
@@ skipping 1488 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }