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This matches the naming and behavior of ImageBitmap::close().

Bug: 1108023
Change-Id: I4f5eac7f97eda4b27a38690b75f3c1e3b7545b9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311110
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790663}