[Sync] Rework unit tests for ChromeInvalidationClient

sync/notifier/mock_invalidation_state_tracker.cc

Index: sync/notifier/mock_invalidation_state_tracker.cc
diff --git a/sync/notifier/mock_invalidation_state_tracker.cc b/sync/notifier/mock_invalidation_state_tracker.cc
deleted file mode 100644
index 37aabb3440f379bec9f3b33f5ff8bf5d696cc3e1..0000000000000000000000000000000000000000
--- a/sync/notifier/mock_invalidation_state_tracker.cc
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2012 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 "sync/notifier/mock_invalidation_state_tracker.h"
-
-namespace syncer {
-
-MockInvalidationStateTracker::MockInvalidationStateTracker() {}
-MockInvalidationStateTracker::~MockInvalidationStateTracker() {}
-
-}  // namespace syncer