[Sync] Move ChangeProcessor to model/.

components/sync/driver/change_processor_mock.cc

Index: components/sync/driver/change_processor_mock.cc
diff --git a/components/sync/driver/change_processor_mock.cc b/components/sync/driver/change_processor_mock.cc
deleted file mode 100644
index cf75e56e146ec90076909715fd05c79562237f3b..0000000000000000000000000000000000000000
--- a/components/sync/driver/change_processor_mock.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2014 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 "components/sync/driver/change_processor_mock.h"
-
-#include "base/compiler_specific.h"
-
-namespace syncer {
-
-ChangeProcessorMock::ChangeProcessorMock() : ChangeProcessor(nullptr) {}
-
-ChangeProcessorMock::~ChangeProcessorMock() {}
-
-}  // namespace syncer