Implement new SyncAPI and convert Preferences to it.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 5c470ebc725be291f8e09012678204ee4f1c0b07..bcc3c5a6fdd033d46ac63a0b67ae47bfba73454b 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1604,8 +1604,8 @@
         'browser/sync/sync_setup_wizard_unittest.cc',
         'browser/sync/sync_ui_util_mac_unittest.mm',
         'browser/sync/sync_ui_util_unittest.cc',
-        'browser/sync/syncable_service_mock.cc',
-        'browser/sync/syncable_service_mock.h',
+        'browser/sync/api/syncable_service_mock.cc',
+        'browser/sync/api/syncable_service_mock.h',
         'browser/sync/test_profile_sync_service.cc',
         'browser/sync/test_profile_sync_service.h',
         'browser/sync/util/cryptographer_unittest.cc',
@@ -3035,6 +3035,7 @@
         'browser/sync/syncable/syncable_enum_conversions_unittest.cc',
         'browser/sync/syncable/syncable_id_unittest.cc',
         'browser/sync/syncable/syncable_unittest.cc',
+        'browser/sync/api/sync_change_unittest.cc',
         'browser/sync/util/data_encryption_unittest.cc',
         'browser/sync/util/extensions_activity_monitor_unittest.cc',
         'browser/sync/util/protobuf_unittest.cc',
@@ -3049,7 +3050,7 @@
         'test/sync/engine/test_id_factory.h',
         'test/sync/engine/test_syncable_utils.cc',
         'test/sync/engine/test_syncable_utils.h',
-        'test/sync/sessions/test_scoped_session_event_listener.h',
+        'test/sync/sessions/test_scoped_session_change_listener.h',
       ],
       'include_dirs': [
         '..',