Revert of [Sync] Erase sync DB when corrupted

sync/sync_tests.gypi

 # Copyright 2013 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': [
     # Test support files for the 'sync_core' target.
     # GN version: //sync:test_support_sync_core
     {
       'target_name': 'test_support_sync_core',
@@ skipping 17 matching lines @@
         'sync',
       ],
       'sources': [
         'internal_api/public/base/model_type_test_util.cc',
         'internal_api/public/base/model_type_test_util.h',
         'js/js_test_util.cc',
         'js/js_test_util.h',
         'sessions/test_util.cc',
         'sessions/test_util.h',
         'test/callback_counter.h',
-        "test/directory_backing_store_corruption_testing.cc",
-        "test/directory_backing_store_corruption_testing.h",
         'test/engine/fake_model_worker.cc',
         'test/engine/fake_model_worker.h',
         'test/engine/fake_sync_scheduler.cc',
         'test/engine/fake_sync_scheduler.h',
         'test/engine/injectable_sync_context_proxy.cc',
         'test/engine/injectable_sync_context_proxy.h',
         'test/engine/mock_connection_manager.cc',
         'test/engine/mock_connection_manager.h',
         'test/engine/mock_model_type_sync_proxy.cc',
         'test/engine/mock_model_type_sync_proxy.h',
@@ skipping 24 matching lines @@
         'test/null_transaction_observer.h',
         'test/sessions/mock_debug_info_getter.cc',
         'test/sessions/mock_debug_info_getter.h',
         'test/sessions/test_scoped_session_event_listener.h',
         'test/test_directory_backing_store.cc',
         'test/test_directory_backing_store.h',
         'test/test_transaction_observer.cc',
         'test/test_transaction_observer.h',
         'test/trackable_mock_invalidation.cc',
         'test/trackable_mock_invalidation.h',
-        'util/mock_unrecoverable_error_handler.cc',
-        'util/mock_unrecoverable_error_handler.h',
         'util/test_unrecoverable_error_handler.cc',
         'util/test_unrecoverable_error_handler.h',
       ],
     },
 
     # Test support files for the python sync test server.
     # GN version: //sync:test_support_sync_testserver
     {
       'target_name': 'test_support_sync_testserver',
       'type': 'static_library',
@@ skipping 443 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'sync_unit_tests',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }