Introduce a layering in the invalidation component as public and impl

components/invalidation/fake_invalidation_handler.h

Index: components/invalidation/fake_invalidation_handler.h
diff --git a/components/invalidation/fake_invalidation_handler.h b/components/invalidation/fake_invalidation_handler.h
deleted file mode 100644
index 8ba2009c526f49b91bdaa892109433a7af6f5648..0000000000000000000000000000000000000000
--- a/components/invalidation/fake_invalidation_handler.h
+++ /dev/null
@@ -1,42 +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.
-
-#ifndef COMPONENTS_INVALIDATION_FAKE_INVALIDATION_HANDLER_H_
-#define COMPONENTS_INVALIDATION_FAKE_INVALIDATION_HANDLER_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "components/invalidation/invalidation_handler.h"
-#include "components/invalidation/object_id_invalidation_map.h"
-
-namespace syncer {
-
-class FakeInvalidationHandler : public InvalidationHandler {
- public:
-  FakeInvalidationHandler();
-  ~FakeInvalidationHandler() override;
-
-  InvalidatorState GetInvalidatorState() const;
-  const ObjectIdInvalidationMap& GetLastInvalidationMap() const;
-  int GetInvalidationCount() const;
-
-  // InvalidationHandler implementation.
-  void OnInvalidatorStateChange(InvalidatorState state) override;
-  void OnIncomingInvalidation(
-      const ObjectIdInvalidationMap& invalidation_map) override;
-  std::string GetOwnerName() const override;
-
- private:
-  InvalidatorState state_;
-  ObjectIdInvalidationMap last_invalidation_map_;
-  int invalidation_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(FakeInvalidationHandler);
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_INVALIDATION_FAKE_INVALIDATION_HANDLER_H_