Clean up outstanding LayoutUnit misuse in WebCore
https://bugs.webkit.org/show_bug.cgi?id=84209

Reviewed by Eric Seidel.

Small changes to a handful of files to prepare trunk for FractionalLayoutUnits.
For more details, see https://trac.webkit.org/wiki/LayoutUnit

No new tests. No change in behavior.

* css/CSSComputedStyleDeclaration.cpp:
(WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue): minimumValueForLength preserves
sub-pixel precision, so we should avoid unnecessarily using integers.
* platform/graphics/FractionalLayoutPoint.h:
(WebCore::FractionalLayoutPoint::FractionalLayoutPoint): Adding an explicit constructor from
FractionalLayoutSizes. This mirrors a method in IntPoint.
* rendering/RenderBoxModelObject.cpp:
(WebCore::RenderBoxModelObject::paintBorder): The rects that change come from roundedRects,
which are already pixel-snapped.
* rendering/RenderBoxModelObject.h: Removing a comment that is no longer applicable.
* rendering/RenderTable.cpp:
(WebCore::RenderTable::computeLogicalWidth): Since we layout tables using integers, we
need to explicitly calculate the width to be integral as well to avoid pushing the next element
over by a pixel that we won't later paint with our own box decorations.
* rendering/RenderText.h:
(RenderText): Correcting an unfortunate mismatch between in the return value of linesBoundingBox
between the header and implementation.
* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::getRoundedBorderFor): We were incorrectly not using the snapped border
rect to pass to calcRadiiFor (which takes an IntRect). Correcting this.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114470 268f45cc-cd09-0410-ab3c-d52691b4dbfc