Remove dead code in BoxPainterBase::PaintNormalBoxShadow

Dead since fd75e9942198e2f00d5713ab7bd44c12b0f3cab2.

Change-Id: I6490435071e027119a27cfcd29f99845c6769d9d
Reviewed-on: https://chromium-review.googlesource.com/c/1434354
Commit-Queue: Stephen Chenney <[email protected]>
Auto-Submit: Fredrik Söderquist <[email protected]>
Reviewed-by: Stephen Chenney <[email protected]>
Cr-Commit-Position: refs/heads/master@{#625779}
1 file changed