Roll src/third_party/libavif/src/ 5fa7c4e22..4eb2d0b58 (11 commits)

https://chromium.googlesource.com/external/github.com/AOMediaCodec/libavif.git/+log/5fa7c4e22c1b..4eb2d0b58ecc

$ git log 5fa7c4e22..4eb2d0b58 --date=short --no-merges --format='%ad %ae %s'
2020-11-11 joedrago Fix comment typo and add parens around macro value
2020-11-11 jdrago Add avifDecoderNthImageReady() avifIO helper function
2020-11-11 jdrago Update changelog
2020-11-11 jdrago Expose maxThreads to avifDecoder, add --jobs to avifdec
2020-11-09 joedrago Minor rewording
2020-11-09 joedrago Create AVIF_VERSION_DEVEL, which allows for in-development changes to be ifdef'd in downstream projects
2020-11-09 joedrago v0.8.3
2020-11-07 wtc Reorder the offset checks in avifIOTestReaderRead
2020-11-09 joedrago Reword avifIOReadFunc comments for clarity (wantehchang)
2020-11-08 joedrago Allow checking the upsampling filter independent of subsampling choice to allow for a means for endusers to opt-out of libyuv, even if it is compiled in
2020-11-07 joedrago Remove misleading comment snippet about libyuv fast paths

Created with:
  roll-dep src/third_party/libavif/src
R=dalecurtis@chromium.org

Bug: 1136922
Change-Id: I832341811c78d8698f75dafa1d3be8e76cb31e24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536034Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#827035}

DEPS

@@ -348,7 +348,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libavif
   # and whatever else without interference from each other.
-  'libavif_revision': '5fa7c4e22c1b0cf3b97834e65b1040a619cf2bbd',
+  'libavif_revision': '4eb2d0b58ecc4481b5074c470b99beb7f8e540e1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling nearby
   # and whatever else without interference from each other.