Removed CopyState() from NavigationManager, as it is unused.

ios/web/navigation/navigation_manager_impl.h

 // Copyright 2013 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_MANAGER_IMPL_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 135 matching lines @@
   // Returns the current list of transient url rewriters, passing ownership to
   // the caller.
   // TODO(crbug.com/546197): remove once NavigationItem creation occurs in this
   // class.
   std::unique_ptr<std::vector<BrowserURLRewriter::URLRewriter>>
   GetTransientURLRewriters();
 
   // Called to reset the transient url rewriter list.
   void RemoveTransientURLRewriters();
 
-  // Copy state from |navigation_manager|, including a copy of that object's
-  // CRWSessionController.
-  void CopyState(NavigationManagerImpl* navigation_manager);
-
   // Returns the navigation index that differs from the current item (or pending
   // item if it exists) by the specified |offset|, skipping redirect navigation
   // items. The index returned is not guaranteed to be valid.
   // TODO(crbug.com/661316): Make this method private once navigation code is
   // moved from CRWWebController to NavigationManagerImpl.
   int GetIndexForOffset(int offset) const;
 
  private:
   // The SessionStorageBuilder functions require access to private variables of
   // NavigationManagerImpl.
@@ skipping 29 matching lines @@
   // List of transient url rewriters added by |AddTransientURLRewriter()|.
   std::unique_ptr<std::vector<BrowserURLRewriter::URLRewriter>>
       transient_url_rewriters_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationManagerImpl);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_IMPL_H_