Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/navigation/crw_serialized_navigation_manager.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_CRW_SERIALIZED_NAVIGATION_MANAGER_H_
+#define IOS_WEB_NAVIGATION_CRW_SERIALIZED_NAVIGATION_MANAGER_H_
+
+#import <Foundation/Foundation.h>
+
+@class CRWSessionCertificatePolicyManager;
+@class XCallbackParameters;
+
+namespace web {
+class NavigationManagerImpl;
+}
+
+// NSCoding-compliant class used to serialize NavigationManager's persisted
+// properties.
+@interface CRWSerializedNavigationManager : NSObject<NSCoding>
+
+// Properties taken from NavigationManagerImpl and CRWSessionController.

[Eugene But (OOO till 7-30), 2015/09/24 18:44:29]

Do you want to mention CRWSessionController here? 

+@property(nonatomic, copy) NSString* tabID;
+@property(nonatomic, copy) NSString* openerID;
+@property(nonatomic, getter=isOpenedByDOM) BOOL openedByDOM;
+@property(nonatomic, assign) NSInteger openerNavigationIndex;

[Eugene But (OOO till 7-30), 2015/09/24 18:44:29]

This property is encoded/decoded as int. NavigationManager uses int as well. So
maybe this property should also be int afterwards?

+@property(nonatomic, copy) NSString* windowName;
+@property(nonatomic, assign) NSInteger currentNavigationIndex;

[Eugene But (OOO till 7-30), 2015/09/24 18:44:29]

ditto

+@property(nonatomic, assign) NSInteger previousNavigationIndex;

[Eugene But (OOO till 7-30), 2015/09/24 18:44:29]

ditto

+@property(nonatomic, assign) NSTimeInterval lastVisitedTimestamp;
+// TODO(kkhorimoto): |entries| currently contains CRWSessionEntries.  Once
+// NavigationItemImpls are encoded/decoded using CRWSerializedNavigationItems
+// (analogous to the approach taken with NavigationManagerImpl), this will
+// become an array of CRWSerializedNavigationItems.
+@property(nonatomic, copy) NSArray* entries;
+@property(nonatomic, retain)
+    CRWSessionCertificatePolicyManager* sessionCertificatePolicyManager;
+@property(nonatomic, retain) XCallbackParameters* XCallbackParameters;
+
+@end
+
+#endif  // IOS_WEB_NAVIGATION_CRW_SERIALIZED_NAVIGATION_MANAGER_H_