[Sync] SyncEngine refactor part 1: interfaces.

components/sync/engine/sync_engine.cc

Index: components/sync/engine/sync_engine.cc
diff --git a/components/sync/driver/glue/sync_backend_host.cc b/components/sync/engine/sync_engine.cc
similarity index 60%
rename from components/sync/driver/glue/sync_backend_host.cc
rename to components/sync/engine/sync_engine.cc
index 76da557deb762a7c3b3e532d8fb4553f96b2dbc9..53482595e3d307e3bc69797aff9ae2495b92cfa7 100644
--- a/components/sync/driver/glue/sync_backend_host.cc
+++ b/components/sync/engine/sync_engine.cc
@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/sync/driver/glue/sync_backend_host.h"
+#include "components/sync/engine/sync_engine.h"
 
 namespace syncer {
 
-SyncBackendHost::SyncBackendHost() {}
-
-SyncBackendHost::~SyncBackendHost() {}
+SyncEngine::SyncEngine() {}
+SyncEngine::~SyncEngine() {}
 
 }  // namespace syncer