Revert of Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/navigation/navigation_manager_storage_builder.h

-// Copyright 2015 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 IOS_WEB_NAVIGATION_SERIALIZED_NAVIGATION_MANAGER_BUILDER_H_
-#define IOS_WEB_NAVIGATION_SERIALIZED_NAVIGATION_MANAGER_BUILDER_H_
-
-#include <memory>
-
-@class CRWNavigationManagerStorage;
-
-namespace web {
-
-class NavigationManagerImpl;
-
-// Class that can serialize and deserialize NavigationManagers.
-class NavigationManagerStorageBuilder {
- public:
-  // Creates a serialized NavigationManager from |navigation_manager|.
-  CRWNavigationManagerStorage* BuildSerialization(
-      NavigationManagerImpl* navigation_manager) const;
-  // Creates a NavigationManager from |navigation_manager_storage|.
-  std::unique_ptr<NavigationManagerImpl> BuildNavigationManagerImpl(
-      CRWNavigationManagerStorage* navigation_manager_storage) const;
-};
-
-}  // namespace web
-
-#endif  // IOS_WEB_NAVIGATION_SERIALIZED_NAVIGATION_MANAGER_BUILDER_H_