Avoid ForceHorriblySlowRectMapping in RenderInline::clippedOverflowRectForPaintInvalidation()

ForceHorriblySlowRectMapping was needed in RenderInline::
clippedOverflowRectForPaintInvalidation() to avoid errors when calling
containingBlock->mapRectToPaintInvalidationBacking() with the provided
paintInvalidationState.

Now call RenderInline's own mapRectToPaintInvalidationBacking() instead
of containingBlock's to make paintInvalidationState applicable and
reduce duplicate code.

BUG=402994
TEST=exsiting tests

Review URL: https://codereview.chromium.org/555933002

git-svn-id: svn://svn.chromium.org/blink/trunk@181921 bbb929c8-8fbe-4397-9dbb-9b2b20218538