[Sync] rename USS processor / worker interfaces

sync/sync_tests.gypi

Index: sync/sync_tests.gypi
diff --git a/sync/sync_tests.gypi b/sync/sync_tests.gypi
index 434d6055b30d4cae3c28d47529e6199af4427881..cc5262e4971931757f752cab8163cf9c8cadb32a 100644
--- a/sync/sync_tests.gypi
+++ b/sync/sync_tests.gypi
@@ -43,12 +43,12 @@
         'test/engine/fake_sync_scheduler.h',
         'test/engine/injectable_sync_context_proxy.cc',
         'test/engine/injectable_sync_context_proxy.h',
+        'test/engine/mock_commit_queue.cc',
+        'test/engine/mock_commit_queue.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',
-        'test/engine/mock_model_type_sync_worker.cc',
-        'test/engine/mock_model_type_sync_worker.h',
+        'test/engine/mock_model_type_processor.cc',
+        'test/engine/mock_model_type_processor.h',
         'test/engine/mock_nudge_handler.cc',
         'test/engine/mock_nudge_handler.h',
         'test/engine/mock_update_handler.cc',
@@ -273,13 +273,13 @@
         'api/sync_merge_result_unittest.cc',
         'engine/apply_control_data_updates_unittest.cc',
         'engine/backoff_delay_provider_unittest.cc',
+        'engine/commit_queue_impl_unittest.cc',
         'engine/directory_commit_contribution_unittest.cc',
         'engine/directory_update_handler_unittest.cc',
         'engine/entity_tracker_unittest.cc',
         'engine/get_updates_processor_unittest.cc',
         'engine/model_type_entity_unittest.cc',
-        'engine/model_type_sync_proxy_impl_unittest.cc',
-        'engine/model_type_sync_worker_impl_unittest.cc',
+        'engine/model_type_processor_impl_unittest.cc',
         'engine/sync_scheduler_unittest.cc',
         'engine/syncer_proto_util_unittest.cc',
         'engine/syncer_unittest.cc',