Reviewed by Hyatt, landed by ap.

WebCore:
        Patch for http://bugzilla.opendarwin.org/show_bug.cgi?id=7604
        calcAbsoluteHorizontalValues() is being getting passed arguments
        in the wrong order in calcAbsoluteHorizontal()

        Cleans up the RenderBox code for absolutely positioned elements
        and adds new functions for replaced absolutely positioned 
        elements. Now uses Length so that magic number -666666 for 
        auto lengths is no longer used.

        * rendering/RenderBox.cpp:
        (WebCore::RenderBox::calcAbsoluteHorizontal):
        (WebCore::RenderBox::calcAbsoluteHorizontalValues):
        (WebCore::RenderBox::calcAbsoluteVertical):
        (WebCore::RenderBox::calcAbsoluteVerticalValues): 
        (WebCore::RenderBox::calcAbsoluteHorizontalReplaced): Handle replaced
        case separately.
        (WebCore::RenderBox::calcAbsoluteVerticalReplaced): ditto.
        * rendering/RenderBox.h:

LayoutTests:
        * fast/block/positioning/absolute-length-of-neg-666666.html: Added.
        * fast/block/positioning/absolute-positioned-overconstrained.html: Added.
        * fast/block/positioning/auto/006.html: Updated to reflect that the containing
        block's direction, not the parent's is used.
        * fast/css/absolute-poition-in-rtl-parent.html: Updated and cleaned up.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14351 268f45cc-cd09-0410-ab3c-d52691b4dbfc