[Sync] Move events files around a bit.

components/sync/engine_impl/events/commit_response_event.h

Index: components/sync/engine_impl/events/commit_response_event.h
diff --git a/components/sync/engine/events/commit_response_event.h b/components/sync/engine_impl/events/commit_response_event.h
similarity index 86%
rename from components/sync/engine/events/commit_response_event.h
rename to components/sync/engine_impl/events/commit_response_event.h
index fa1668042e6f0dc87a2a77ae62109f5900645204..dd02d53e4c1d7fc68a7eb4c760739a5fa11e5188 100644
--- a/components/sync/engine/events/commit_response_event.h
+++ b/components/sync/engine_impl/events/commit_response_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_RESPONSE_EVENT_H_
-#define COMPONENTS_SYNC_ENGINE_EVENTS_COMMIT_RESPONSE_EVENT_H_
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_EVENTS_COMMIT_RESPONSE_EVENT_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_EVENTS_COMMIT_RESPONSE_EVENT_H_
 
 #include <cstddef>
 #include <memory>
@@ -45,4 +45,4 @@ class CommitResponseEvent : public ProtocolEvent {
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_ENGINE_EVENTS_COMMIT_RESPONSE_EVENT_H_
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_EVENTS_COMMIT_RESPONSE_EVENT_H_