Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/navigation/serialized_navigation_manager_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_
+
+#import <Foundation/Foundation.h>
+
+#include "base/memory/scoped_ptr.h"
+
+@class CRWSerializedNavigationManager;
+
+namespace web {
+
+class NavigationManagerImpl;
+
+class SerializedNavigationManagerBuilder {
+ public:
+  // Construct an autoreleased CRWSerializedNavigationManager from
+  // |navigationManager|.
+  static CRWSerializedNavigationManager* FromNavigationManager(
+      NavigationManagerImpl* navigation_manager);
+
+  // Constructs a NavigationManagerImpl from |serializedNavigationManager|.
+  static scoped_ptr<NavigationManagerImpl> ToNavigationManager(
+      CRWSerializedNavigationManager* serialized_navigation_manager);
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_NAVIGATION_SERIALIZED_NAVIGATION_MANAGER_BUILDER_H_