Cleanup namespace usage in Source/core/{dom/* & fileapi/*}

Source/core/dom/VisitedLinkState.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 81 matching lines @@
 
     // An empty attribute refers to the document itself which is always
     // visited. It is useful to check this explicitly so that visited
     // links can be tested in platform independent manner, without
     // explicit support in the test harness.
     if (attribute.isEmpty())
         return InsideVisitedLink;
 
     if (LinkHash hash = linkHashForElement(element, attribute)) {
         m_linksCheckedForVisitedState.add(hash);
-        if (blink::Platform::current()->isLinkVisited(hash))
+        if (Platform::current()->isLinkVisited(hash))
             return InsideVisitedLink;
     }
 
     return InsideUnvisitedLink;
 }
 
 void VisitedLinkState::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
 }
 
-}
+} // namespace blink