Use shrink-to-fit for width for Button, input, select, textarea, and legend treat width value of 'a…

Source/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 393 matching lines @@
         return document().inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isRoot() || isBody()) && !document().shouldDisplaySeamlesslyWithParent() && !isInline();
     }
 
     virtual LayoutSize intrinsicSize() const { return LayoutSize(); }
     LayoutUnit intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
     LayoutUnit intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
 
     // Whether or not the element shrinks to its intrinsic width (rather than filling the width
     // of a containing block).  HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
     bool sizesLogicalWidthToFitContent(SizeType) const;
+    bool isElementWithIntrinsicWidth() const;
 
     LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlock* cb, RenderRegion*) const;
 
     LayoutUnit computeLogicalWidthInRegionUsing(SizeType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* containingBlock, RenderRegion*) const;
     LayoutUnit computeLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit computeContentLogicalHeight(const Length& height, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit computeContentAndScrollbarLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit computeReplacedLogicalWidthUsing(Length width) const;
     LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred  = ComputeActual) const;
     LayoutUnit computeReplacedLogicalHeightUsing(Length height) const;
@@ skipping 333 matching lines @@
         if (UNLIKELY(m_inlineBoxWrapper != 0))
             deleteLineBoxWrapper();
     }
 
     m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace WebCore
 
 #endif // RenderBox_h