[Sync] Move events files around a bit.

components/sync/engine_impl/events/commit_request_event.h

Index: components/sync/engine_impl/events/commit_request_event.h
diff --git a/components/sync/engine/events/commit_request_event.h b/components/sync/engine_impl/events/commit_request_event.h
similarity index 87%
rename from components/sync/engine/events/commit_request_event.h
rename to components/sync/engine_impl/events/commit_request_event.h
index 13ac7abde5ccb2da01e476d0bada4fb31c6b7846..b9d8030d6c3a8b88707d27b9643534e1c6065da2 100644
--- a/components/sync/engine/events/commit_request_event.h
+++ b/components/sync/engine_impl/events/commit_request_event.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_SYNC_ENGINE_EVENTS_COMMIT_REQUEST_EVENT_H_
-#define COMPONENTS_SYNC_ENGINE_EVENTS_COMMIT_REQUEST_EVENT_H_
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_EVENTS_COMMIT_REQUEST_EVENT_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_EVENTS_COMMIT_REQUEST_EVENT_H_
 
 #include <cstddef>
 #include <memory>
@@ -47,4 +47,4 @@ class CommitRequestEvent : public ProtocolEvent {
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_ENGINE_EVENTS_COMMIT_REQUEST_EVENT_H_
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_EVENTS_COMMIT_REQUEST_EVENT_H_