Split up SyncEngineEventListener callbacks

sync/engine/sync_engine_event_listener.cc

Index: sync/engine/sync_engine_event_listener.cc
diff --git a/sync/engine/sync_engine_event.cc b/sync/engine/sync_engine_event_listener.cc
similarity index 57%
rename from sync/engine/sync_engine_event.cc
rename to sync/engine/sync_engine_event_listener.cc
index 2df3d6284c527bc7b8cbb98e6d1fafe5f3b995f3..d548ecca088bc815a9a7a1988dacfd19e0a8ae86 100644
--- a/sync/engine/sync_engine_event.cc
+++ b/sync/engine/sync_engine_event_listener.cc
@@ -2,13 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "sync/engine/sync_engine_event.h"
+#include "sync/engine/sync_engine_event_listener.h"
 
 namespace syncer {
 
-SyncEngineEvent::SyncEngineEvent(EventCause cause) : what_happened(cause) {
-}
+SyncEngineEventListener::SyncEngineEventListener() {}
 
-SyncEngineEvent::~SyncEngineEvent() {}
+SyncEngineEventListener::~SyncEngineEventListener() {}
 
 }  // namespace syncer