This CL changes 'HasNext' to 'HasFrame' and 'Next' to 'Advance' to
better reflect the semantics of the iterator.
'Next' usually returns the next element.

R=jgruber@chromium.org

Bug: v8:8562
Change-Id: Idbd1c084c39dd4a10c1c6a6db7782637b9b16cc4
Reviewed-on: https://chromium-review.googlesource.com/c/1436023Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59117}