Use TabLoader in TabRestoreService.

components/sessions/ios/ios_live_tab.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 "components/sessions/ios/ios_live_tab.h"
 #include "ios/web/public/navigation_manager.h"
 
 namespace {
 const char kIOSLiveTabWebStateUserDataKey[] = "ios_live_tab";
 }
@@ skipping 36 matching lines @@
 
 sessions::SerializedNavigationEntry IOSLiveTab::GetPendingEntry() {
   return sessions::IOSSerializedNavigationBuilder::FromNavigationItem(
       GetPendingEntryIndex(), *navigation_manager()->GetPendingItem());
 }
 
 int IOSLiveTab::GetEntryCount() {
   return navigation_manager()->GetItemCount();
 }
 
-void IOSLiveTab::LoadIfNecessary() {
-  navigation_manager()->LoadIfNecessary();
-}
-
 const std::string& IOSLiveTab::GetUserAgentOverride() const {
   // Dynamic user agent overrides are not supported on iOS.
   return user_agent_override_;
 }
 
 }  // namespace sessions