[Sync] Rework unit tests for ChromeInvalidationClient

sync/notifier/mock_invalidation_state_tracker.h

-// 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.
-
-#ifndef SYNC_NOTIFIER_MOCK_INVALIDATION_STATE_TRACKER_H_
-#define SYNC_NOTIFIER_MOCK_INVALIDATION_STATE_TRACKER_H_
-
-#include "base/memory/weak_ptr.h"
-#include "sync/notifier/invalidation_state_tracker.h"
-#include "testing/gmock/include/gmock/gmock.h"
-
-namespace syncer {
-
-class MockInvalidationStateTracker
-    : public InvalidationStateTracker,
-      public base::SupportsWeakPtr<MockInvalidationStateTracker> {
- public:
-  MockInvalidationStateTracker();
-  virtual ~MockInvalidationStateTracker();
-
-  MOCK_CONST_METHOD0(GetAllMaxVersions, InvalidationVersionMap());
-  MOCK_METHOD2(SetMaxVersion, void(const invalidation::ObjectId&, int64));
-  MOCK_CONST_METHOD0(GetInvalidationState, std::string());
-  MOCK_METHOD1(SetInvalidationState, void(const std::string&));
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_NOTIFIER_MOCK_INVALIDATION_STATE_TRACKER_H_