Remove the concept of currentItemIndex

ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm

 // 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.
 
 #include "ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.h"
 
 #include "base/memory/ref_counted.h"
 #include "components/sessions/ios/ios_serialized_navigation_builder.h"
 #include "components/sync_sessions/sync_sessions_client.h"
 #include "components/sync_sessions/synced_window_delegate.h"
@@ skipping 43 matching lines @@
 
 std::string IOSChromeSyncedTabDelegate::GetExtensionAppId() const {
   return std::string();
 }
 
 bool IOSChromeSyncedTabDelegate::IsInitialBlankNavigation() const {
   return web_state_->GetNavigationManager()->GetItemCount() == 0;
 }
 
 int IOSChromeSyncedTabDelegate::GetCurrentEntryIndex() const {
-  return web_state_->GetNavigationManager()->GetCurrentItemIndex();
+  return web_state_->GetNavigationManager()->GetLastCommittedItemIndex();
 }
 
 int IOSChromeSyncedTabDelegate::GetEntryCount() const {
   return web_state_->GetNavigationManager()->GetItemCount();
 }
 
 GURL IOSChromeSyncedTabDelegate::GetVirtualURLAtIndex(int i) const {
   NavigationItem* item = GetPossiblyPendingItemAtIndex(web_state_, i);
   return item ? item->GetVirtualURL() : GURL();
 }
@@ skipping 52 matching lines @@
   for (int i = 0; i < entry_count; ++i) {
     const GURL& virtual_url = GetVirtualURLAtIndex(i);
     if (!virtual_url.is_valid())
       continue;
 
     if (sessions_client->ShouldSyncURL(virtual_url))
       return true;
   }
   return false;
 }