Use new is*Element() helper functions more in rendering code

Source/core/rendering/RenderTable.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, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 11 matching lines @@
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/rendering/RenderTable.h"
 
 #include "HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
+#include "core/html/HTMLTableElement.h"
 #include "core/rendering/AutoTableLayout.h"
 #include "core/rendering/FastTextAutosizer.h"
 #include "core/rendering/FixedTableLayout.h"
 #include "core/rendering/GraphicsContextAnnotator.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/LayoutRectRecorder.h"
 #include "core/rendering/LayoutRepainter.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderTableCaption.h"
 #include "core/rendering/RenderTableCell.h"
@@ skipping 283 matching lines @@
 }
 
 // This method takes a RenderStyle's logical width, min-width, or max-width length and computes its actual value.
 LayoutUnit RenderTable::convertStyleLogicalWidthToComputedWidth(const Length& styleLogicalWidth, LayoutUnit availableWidth)
 {
     if (styleLogicalWidth.isIntrinsic())
         return computeIntrinsicLogicalWidthUsing(styleLogicalWidth, availableWidth, bordersPaddingAndSpacingInRowDirection());
 
     // HTML tables' width styles already include borders and paddings, but CSS tables' width styles do not.
     LayoutUnit borders = 0;
-    bool isCSSTable = !node() || !node()->hasTagName(tableTag);
+    bool isCSSTable = !isHTMLTableElement(node());
     if (isCSSTable && styleLogicalWidth.isSpecified() && styleLogicalWidth.isPositive() && style()->boxSizing() == CONTENT_BOX)
         borders = borderStart() + borderEnd() + (collapseBorders() ? LayoutUnit() : paddingStart() + paddingEnd());
 
     return minimumValueForLength(styleLogicalWidth, availableWidth) + borders;
 }
 
 LayoutUnit RenderTable::convertStyleLogicalHeightToComputedHeight(const Length& styleLogicalHeight)
 {
     LayoutUnit borderAndPaddingBefore = borderBefore() + (collapseBorders() ? LayoutUnit() : paddingBefore());
     LayoutUnit borderAndPaddingAfter = borderAfter() + (collapseBorders() ? LayoutUnit() : paddingAfter());
     LayoutUnit borderAndPadding = borderAndPaddingBefore + borderAndPaddingAfter;
     LayoutUnit computedLogicalHeight = 0;
     if (styleLogicalHeight.isFixed()) {
         // HTML tables size as though CSS height includes border/padding, CSS tables do not.
         LayoutUnit borders = LayoutUnit();
         // FIXME: We cannot apply box-sizing: content-box on <table> which other browsers allow.
-        if ((node() && node()->hasTagName(tableTag)) || style()->boxSizing() == BORDER_BOX) {
+        if (isHTMLTableElement(node()) || style()->boxSizing() == BORDER_BOX) {
             borders = borderAndPadding;
         }
         computedLogicalHeight = styleLogicalHeight.value() - borders;
     } else if (styleLogicalHeight.isPercent())
         computedLogicalHeight = computePercentageLogicalHeight(styleLogicalHeight);
     else if (styleLogicalHeight.isIntrinsic())
         computedLogicalHeight = computeIntrinsicLogicalContentHeightUsing(styleLogicalHeight, logicalHeight() - borderAndPadding, borderAndPadding);
     else
         ASSERT_NOT_REACHED();
     return max<LayoutUnit>(0, computedLogicalHeight);
@@ skipping 1094 matching lines @@
 const BorderValue& RenderTable::tableEndBorderAdjoiningCell(const RenderTableCell* cell) const
 {
     ASSERT(cell->isFirstOrLastCellInRow());
     if (hasSameDirectionAs(cell->row()))
         return style()->borderEnd();
 
     return style()->borderStart();
 }
 
 }