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This CL removes uses of VectorFromPPPoint() since it no longer has a
caller, and replaces PPPointFromVector() with a pp::Point constructor.

Change-Id: I773be154d1eb844325832ff1248147a890c36f73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2604953
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840752}