[Sync] Split DirectoryChangeListener for thread-safety

chrome/browser/sync/syncable/syncable_mock.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/syncable/syncable_mock.h"
 
+#include "base/tracked.h"
+
 MockDirectory::MockDirectory() {
-  init_kernel("myk");
+  InitKernel("myk", &delegate_);
 }
 
 MockDirectory::~MockDirectory() {}
 
 MockSyncableWriteTransaction::MockSyncableWriteTransaction(
     Directory *directory)
-    : WriteTransaction(directory, syncable::UNITTEST, "dontcare.cpp", 25) {
+    : WriteTransaction(directory, syncable::UNITTEST, FROM_HERE) {
 }