Removed dead code from NavigationManagerImpl::GetIndexForOffset.

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 312 matching lines @@
     }
   }
 
   _pendingItem = [self itemWithURL:url
                           referrer:ref
                         transition:trans
                     initiationType:initiationType];
 
   if (_navigationManager && _navigationManager->GetFacadeDelegate())
     _navigationManager->GetFacadeDelegate()->OnNavigationItemPending();
+  DCHECK_EQ(-1, self.pendingItemIndex);
 }
 
 - (void)updatePendingItem:(const GURL&)url {
   // If there is no pending item, navigation is probably happening within the
   // session history. Don't modify the item list.
   web::NavigationItemImpl* item = self.pendingItem;
   if (!item)
     return;
 
   if (url != item->GetURL()) {
@@ skipping 282 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