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

ios/web/navigation/crw_session_controller.mm

 // Copyright 2012 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.
 
 #import "ios/web/navigation/crw_session_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 256 matching lines @@
                                     @"\nprevious index: %" PRIdNS
                                     @"\npending"
                                     @" index: %" PRIdNS
                                     @"\n%@\npending: %@\ntransient: %@\n",
                                     _currentNavigationIndex,
                                     _previousNavigationIndex, _pendingItemIndex,
                                     itemsDescription, pendingItemDescription,
                                     transientItemDescription];
 }
 
-#pragma mark - NSCopying
-
-- (id)copyWithZone:(NSZone*)zone {
-  CRWSessionController* copy = [[[self class] alloc] init];
-  copy->_openedByDOM = _openedByDOM;
-  copy->_currentNavigationIndex = _currentNavigationIndex;
-  copy->_previousNavigationIndex = _previousNavigationIndex;
-  copy->_pendingItemIndex = _pendingItemIndex;
-  copy->_sessionCertificatePolicyManager =
-      [_sessionCertificatePolicyManager copy];
-  web::ScopedNavigationItemImplList itemCopies(self.items.size());
-  for (size_t index = 0; index < self.items.size(); ++index) {
-    itemCopies[index] =
-        base::MakeUnique<web::NavigationItemImpl>(*self.items[index]);
-  }
-  std::swap(copy->_items, itemCopies);
-  return copy;
-}
-
 #pragma mark - Public
 
 - (void)setNavigationManager:(web::NavigationManagerImpl*)navigationManager {
   _navigationManager = navigationManager;
   if (_navigationManager) {
     // _browserState will be nullptr if CRWSessionController has been
     // initialized with -initWithCoder: method. Take _browserState from
     // NavigationManagerImpl if that's the case.
     if (!_browserState) {
       _browserState = _navigationManager->GetBrowserState();
@@ skipping 338 matching lines @@
   return item;
 }
 
 - (BOOL)isRedirectTransitionForItemAtIndex:(size_t)index {
   DCHECK_LT(index, self.items.size());
   ui::PageTransition transition = self.items[index]->GetTransitionType();
   return (transition & ui::PAGE_TRANSITION_IS_REDIRECT_MASK) ? YES : NO;
 }
 
 @end