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1. Don't null-check after pointer cast, because it will never be null
   (unless the DCHECK on the previous line had already failed, however
   this clearly never happens because the same pointer is de-reffed on
   the next line, so we'd have seen crashes)

2. Combine two methods instead of having one method thunk to the other.

Bug: none
Change-Id: Id67f5cf04fda40ec694689452c403601402cc306
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575892
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835607}