Remove "using namespace" statements from headers

Source/core/rendering/RenderBlockLineLayout.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 26 matching lines @@
 #include "core/rendering/line/LineLayoutState.h"
 #include "core/rendering/svg/SVGRootInlineBox.h"
 #include "platform/text/BidiResolver.h"
 #include "wtf/RefCountedLeakCounter.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
 #include "wtf/unicode/CharacterNames.h"
 
 namespace WebCore {
 
+using namespace std;
+using namespace WTF::Unicode;
+
 static IndentTextOrNot requiresIndent(bool isFirstLine, bool isAfterHardLineBreak, RenderStyle* style)
 {
     if (isFirstLine)
         return IndentText;
     if (isAfterHardLineBreak && style->textIndentLine() == TextIndentEachLine)
         return IndentText;
 
     return DoNotIndentText;
 }
 
@@ skipping 2188 matching lines @@
     lineGridBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache);
 
     setLineGridBox(lineGridBox);
 
     // FIXME: If any of the characteristics of the box change compared to the old one, then we need to do a deep dirtying
     // (similar to what happens when the page height changes). Ideally, though, we only do this if someone is actually snapping
     // to this grid.
 }
 
 }