Make calls to AtomicString(const String&) explicit in html/

Source/core/frame/Navigator.cpp

 /*
  *  Copyright (C) 2000 Harri Porten (porten@kde.org)
  *  Copyright (c) 2000 Daniel Molkentin (molkentin@kde.org)
  *  Copyright (c) 2000 Stefan Schimanski (schimmi@kde.org)
  *  Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.
  *  Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 40 matching lines @@
 Navigator::Navigator(Frame* frame)
     : DOMWindowProperty(frame)
 {
     ScriptWrappable::init(this);
 }
 
 Navigator::~Navigator()
 {
 }
 
-String Navigator::language() const
+AtomicString Navigator::language() const
 {
     return defaultLanguage();
 }
 
 String Navigator::productSub() const
 {
     return WEBCORE_NAVIGATOR_PRODUCT_SUB;
 }
 
 String Navigator::vendor() const
@@ skipping 51 matching lines @@
 
     return true;
 }
 
 void Navigator::getStorageUpdates()
 {
     // FIXME: Remove this method or rename to yieldForStorageUpdates.
 }
 
 } // namespace WebCore