Moved serialization out of CRWSessionEntry.

ios/web/navigation/navigation_item_impl.h

 // 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 IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
 #include "ios/web/navigation/navigation_item_facade_delegate.h"
 #include "ios/web/public/favicon_status.h"
 #import "ios/web/public/navigation_item.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/ssl_status.h"
 #include "url/gurl.h"
 
 namespace web {
 
 class NavigationItemFacadeDelegate;
+class NavigationItemStorageBuilder;
 
 // Implementation of NavigationItem.
 class NavigationItemImpl : public web::NavigationItem {
  public:
   // Creates a default NavigationItemImpl.
   NavigationItemImpl();
   ~NavigationItemImpl() override;
 
   // Since NavigationItemImpls own their facade delegates, there is no implicit
   // copy constructor (scoped_ptrs can't be copied), so one is defined here.
@@ skipping 79 matching lines @@
   void ResetForCommit();
 
   // Whether this (pending) navigation is renderer-initiated.  Resets to false
   // for all types of navigations after commit.
   void set_is_renderer_initiated(bool is_renderer_initiated) {
     is_renderer_initiated_ = is_renderer_initiated;
   }
   bool is_renderer_initiated() const { return is_renderer_initiated_; }
 
  private:
+  // The NavigationManItemStorageBuilder functions require access to
+  // private variables of NavigationItemImpl.
+  friend NavigationItemStorageBuilder;
+
   int unique_id_;
   GURL original_request_url_;
   GURL url_;
   Referrer referrer_;
   GURL virtual_url_;
   base::string16 title_;
   PageDisplayState page_display_state_;
   ui::PageTransition transition_type_;
   FaviconStatus favicon_;
   SSLStatus ssl_;
@@ skipping 22 matching lines @@
 
   // Weak pointer to the facade delegate.
   std::unique_ptr<NavigationItemFacadeDelegate> facade_delegate_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_