Remove duplicated code from sync related unit tests.

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.
     {
       'target_name': 'test_support_sync_core',
       'type': 'static_library',
@@ skipping 197 matching lines @@
       ],
       'export_dependent_settings': [
         '../testing/gmock.gyp:gmock',
         'sync',
       ],
       'sources': [
         'api/fake_syncable_service.cc',
         'api/fake_syncable_service.h',
         'api/fake_sync_change_processor.cc',
         'api/fake_sync_change_processor.h',
+        'api/sync_change_processor_wrapper_for_test.cc',
+        'api/sync_change_processor_wrapper_for_test.h',
         'api/sync_error_factory_mock.cc',
         'api/sync_error_factory_mock.h',
       ],
     },
 
     # Unit tests for the 'sync_core' target.  This cannot be a static
     # library because the unit test files have to be compiled directly
     # into the executable, so we push the target files to the
     # depending executable target via direct_dependent_settings.
     {
@@ skipping 424 matching lines @@
           'variables': {
             'test_suite_name': 'sync_unit_tests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)sync_unit_tests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }