Make sure getAttribute() / setAttribute() callers use AtomicStrings

Source/core/rendering/RenderTableCell.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple 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
@@ skipping 135 matching lines @@
 {
     // The child cells rely on the grids up in the sections to do their computePreferredLogicalWidths work.  Normally the sections are set up early, as table
     // cells are added, but relayout can cause the cells to be freed, leaving stale pointers in the sections'
     // grids.  We must refresh those grids before the child cells try to use them.
     table()->recalcSectionsIfNeeded();
 
     RenderBlock::computePreferredLogicalWidths();
     if (node() && style()->autoWrap()) {
         // See if nowrap was set.
         Length w = styleOrColLogicalWidth();
-        String nowrap = toElement(node())->getAttribute(nowrapAttr);
+        const AtomicString& nowrap = toElement(node())->getAttribute(nowrapAttr);
         if (!nowrap.isNull() && w.isFixed())
             // Nowrap is set, but we didn't actually use it because of the
             // fixed width set on the cell.  Even so, it is a WinIE/Moz trait
             // to make the minwidth of the cell into the fixed width.  They do this
             // even in strict mode, so do not make this a quirk.  Affected the top
             // of hiptop.com.
             m_minPreferredLogicalWidth = max<LayoutUnit>(w.value(), m_minPreferredLogicalWidth);
     }
 }
 
@@ skipping 1106 matching lines @@
 
 RenderTableCell* RenderTableCell::createAnonymousWithParentRenderer(const RenderObject* parent)
 {
     RenderTableCell* newCell = RenderTableCell::createAnonymous(&parent->document());
     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), TABLE_CELL);
     newCell->setStyle(newStyle.release());
     return newCell;
 }
 
 } // namespace WebCore