[Sync] Move events files around a bit.

components/sync/BUILD.gn

Index: components/sync/BUILD.gn
diff --git a/components/sync/BUILD.gn b/components/sync/BUILD.gn
index ca4f6f3d1302c9fe2b7b984ce14997ace8173407..a9abf95258e982e796211d1456b497d36a376ff5 100644
--- a/components/sync/BUILD.gn
+++ b/components/sync/BUILD.gn
@@ -137,8 +137,6 @@ static_library("sync") {
     "driver/model_type_controller.h",
     "driver/non_ui_data_type_controller.cc",
     "driver/non_ui_data_type_controller.h",
-    "driver/protocol_event_observer.cc",
-    "driver/protocol_event_observer.h",
     "driver/proxy_data_type_controller.cc",
     "driver/proxy_data_type_controller.h",
     "driver/shared_change_processor.cc",
@@ -216,24 +214,10 @@ static_library("sync") {
     "engine/engine_components_factory_impl.h",
     "engine/engine_util.cc",
     "engine/engine_util.h",
-    "engine/events/clear_server_data_request_event.cc",
-    "engine/events/clear_server_data_request_event.h",
-    "engine/events/clear_server_data_response_event.cc",
-    "engine/events/clear_server_data_response_event.h",
-    "engine/events/commit_request_event.cc",
-    "engine/events/commit_request_event.h",
-    "engine/events/commit_response_event.cc",
-    "engine/events/commit_response_event.h",
-    "engine/events/configure_get_updates_request_event.cc",
-    "engine/events/configure_get_updates_request_event.h",
-    "engine/events/get_updates_response_event.cc",
-    "engine/events/get_updates_response_event.h",
-    "engine/events/normal_get_updates_request_event.cc",
-    "engine/events/normal_get_updates_request_event.h",
-    "engine/events/poll_get_updates_request_event.cc",
-    "engine/events/poll_get_updates_request_event.h",
     "engine/events/protocol_event.cc",
     "engine/events/protocol_event.h",
+    "engine/events/protocol_event_observer.cc",
+    "engine/events/protocol_event_observer.h",
     "engine/model_safe_worker.cc",
     "engine/model_safe_worker.h",
     "engine/model_type_connector.cc",
@@ -314,6 +298,22 @@ static_library("sync") {
     "engine_impl/directory_commit_contributor.h",
     "engine_impl/directory_update_handler.cc",
     "engine_impl/directory_update_handler.h",
+    "engine_impl/events/clear_server_data_request_event.cc",
+    "engine_impl/events/clear_server_data_request_event.h",
+    "engine_impl/events/clear_server_data_response_event.cc",
+    "engine_impl/events/clear_server_data_response_event.h",
+    "engine_impl/events/commit_request_event.cc",
+    "engine_impl/events/commit_request_event.h",
+    "engine_impl/events/commit_response_event.cc",
+    "engine_impl/events/commit_response_event.h",
+    "engine_impl/events/configure_get_updates_request_event.cc",
+    "engine_impl/events/configure_get_updates_request_event.h",
+    "engine_impl/events/get_updates_response_event.cc",
+    "engine_impl/events/get_updates_response_event.h",
+    "engine_impl/events/normal_get_updates_request_event.cc",
+    "engine_impl/events/normal_get_updates_request_event.h",
+    "engine_impl/events/poll_get_updates_request_event.cc",
+    "engine_impl/events/poll_get_updates_request_event.h",
     "engine_impl/events/protocol_event_buffer.cc",
     "engine_impl/events/protocol_event_buffer.h",
     "engine_impl/get_commit_ids.cc",