Use TabLoader in TabRestoreService.

components/sessions/core/live_tab.h

 // 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.
 
 #ifndef COMPONENTS_SESSIONS_CORE_LIVE_TAB_H_
 #define COMPONENTS_SESSIONS_CORE_LIVE_TAB_H_
 
 #include "components/sessions/core/serialized_navigation_entry.h"
 #include "components/sessions/core/sessions_export.h"
 #include "components/sessions/core/tab_restore_service.h"
@@ skipping 14 matching lines @@
   virtual int GetPendingEntryIndex() = 0;
   virtual SerializedNavigationEntry GetEntryAtIndex(int index) = 0;
   virtual SerializedNavigationEntry GetPendingEntry() = 0;
   virtual int GetEntryCount() = 0;
 
   // Returns any platform-specific data that should be associated with the
   // TabRestoreService::Tab corresponding to this instance. The default
   // implementation returns null.
   virtual std::unique_ptr<PlatformSpecificTabData> GetPlatformSpecificTabData();
 
-  // Loads the current page if necessary (where "necessary" is defined on a
-  // platform-specific basis).
-  virtual void LoadIfNecessary() = 0;
-
   // Returns the user agent override, if any.
   virtual const std::string& GetUserAgentOverride() const = 0;
 };
 
 }  // namespace sessions
 
 #endif  // COMPONENTS_SESSIONS_CORE_LIVE_TAB_H_