Clean up old legacy preference migration logic.

components/components_tests.gyp

 # Copyright 2014 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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 574 matching lines @@
       'precache/core/precache_database_unittest.cc',
       'precache/core/precache_fetcher_unittest.cc',
       'precache/core/precache_session_table_unittest.cc',
       'precache/core/precache_url_table_unittest.cc',
     ],
     'user_prefs_unittest_sources': [
       'user_prefs/tracked/device_id_unittest.cc',
       'user_prefs/tracked/pref_hash_calculator_unittest.cc',
       'user_prefs/tracked/pref_hash_filter_unittest.cc',
       'user_prefs/tracked/pref_hash_store_impl_unittest.cc',
-      'user_prefs/tracked/pref_service_hash_store_contents_unittest.cc',
       'user_prefs/tracked/segregated_pref_store_unittest.cc',
       'user_prefs/tracked/tracked_preferences_migration_unittest.cc',
     ],
     'proximity_auth_unittest_sources': [
       'proximity_auth/ble/bluetooth_low_energy_characteristics_finder_unittest.cc',
       'proximity_auth/ble/bluetooth_low_energy_connection_finder_unittest.cc',
       'proximity_auth/ble/bluetooth_low_energy_connection_unittest.cc',
       'proximity_auth/ble/bluetooth_low_energy_device_whitelist_unittest.cc',
       'proximity_auth/bluetooth_connection_finder_unittest.cc',
       'proximity_auth/bluetooth_connection_unittest.cc',
@@ skipping 1351 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }