Add a new RenderBoxModelObject class that will eventually act as the direct base class for RenderInlines.  For
        now just adding the class and putting it in between RenderObject and RenderBox in the hierarchy.  RenderInline remains
        derived from RenderBox for now.

        Reviewed by Sam Weinig

        * WebCore.xcodeproj/project.pbxproj:
        * rendering/RenderBox.cpp:
        (WebCore::RenderBox::RenderBox):
        (WebCore::RenderBox::destroy):
        (WebCore::RenderBox::styleWillChange):
        (WebCore::RenderBox::styleDidChange):
        (WebCore::RenderBox::computeRectForRepaint):
        * rendering/RenderBox.h:
        * rendering/RenderBoxModelObject.cpp: Added.
        (WebCore::RenderBoxModelObject::RenderBoxModelObject):
        (WebCore::RenderBoxModelObject::~RenderBoxModelObject):
        * rendering/RenderBoxModelObject.h: Added.
        * rendering/RenderObject.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@40665 268f45cc-cd09-0410-ab3c-d52691b4dbfc