[LayoutReloaded] Remove all FormattingContext::absolute*Box functions.

[LayoutReloaded] Remove all FormattingContext::absolute*Box functions.
https://bugs.webkit.org/show_bug.cgi?id=184215

Reviewed by Antti Koivisto.

Use Display.Box instead.

* LayoutReloaded/FormattingContext/BlockFormatting/BlockFormattingContext.js:
(BlockFormattingContext.prototype._computeOutOfFlowPosition):
* LayoutReloaded/FormattingContext/FloatingContext.js:
(FloatingContext.prototype._availableSpace):
(FloatingContext.prototype._adjustedFloatingPosition):
(FloatingContext.prototype._mapBorderBoxToFormattingRoot):
(FloatingContext.prototype._mapContentBoxToFormattingRoot):
* LayoutReloaded/FormattingContext/FormattingContext.js:
(FormattingContext.prototype.absoluteBorderBox): Deleted.
(FormattingContext.prototype.absolutePaddingBox): Deleted.
(FormattingContext.prototype.absoluteContentBox): Deleted.
(FormattingContext.prototype._toAbsolutePosition): Deleted.
(FormattingContext.prototype._toRootAbsolutePosition): Deleted.
* LayoutReloaded/Utils.js:
(Utils.mapPosition):
(Utils.marginBox):
(Utils.borderBox):
(Utils.contentBox):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@230137 268f45cc-cd09-0410-ab3c-d52691b4dbfc