[Sync] Move //components/sync to the syncer namespace.

components/sync/core_impl/js_sync_manager_observer.h

Index: components/sync/core_impl/js_sync_manager_observer.h
diff --git a/components/sync/core_impl/js_sync_manager_observer.h b/components/sync/core_impl/js_sync_manager_observer.h
index fe380a7e28a81f6db4a7990d0ef789ec7212aae7..1e74ea0f7b20e96066b8a356bcbff5ce72e09689 100644
--- a/components/sync/core_impl/js_sync_manager_observer.h
+++ b/components/sync/core_impl/js_sync_manager_observer.h
@@ -37,10 +37,10 @@ class JsSyncManagerObserver : public SyncManager::Observer {
       const WeakHandle<JsBackend>& js_backend,
       const WeakHandle<DataTypeDebugInfoListener>& debug_info_listener,
       bool success,
-      syncer::ModelTypeSet restored_types) override;
+      ModelTypeSet restored_types) override;
   void OnActionableError(const SyncProtocolError& sync_protocol_error) override;
   void OnProtocolEvent(const ProtocolEvent& event) override;
-  void OnMigrationRequested(syncer::ModelTypeSet types) override;
+  void OnMigrationRequested(ModelTypeSet types) override;
 
  private:
   void HandleJsEvent(const tracked_objects::Location& from_here,