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Since third_party/libavif is only used by
third_party/blink/renderer/platform/image-decoders, it makes more sense
for third_party/libavif to be in the same component as
third_party/blink/renderer/platform/image-decoders.

Change-Id: I92c464f662065267311c412e18279e76086ac364
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302941Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#789539}