Make NGPaintFragmentTraversal::InlineDescendantsOf() to return vector of NGPaintFragment*

This patch changes |NGPaintFragmentTraversal::InlineDescendantsOf()| to return
vector of |NGPaintFragment*| instead of |NGPaintFragmentWithContainerOffset|
since all call sites use |NGPaintFragment*| for improving code health.

Change-Id: Ic6b0fbf3ed19125181958f3048a287dfce46e7fd
Reviewed-on: https://chromium-review.googlesource.com/c/1475329
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633224}
4 files changed