Roll Fuchsia SDK from 891266538247 to 891263989831

The AutoRoll server is located here: https://autoroll.skia.org/r/fuchsia-sdk-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


CQ_INCLUDE_TRYBOTS=luci.chromium.try:fuchsia-arm64-cast;luci.chromium.try:fuchsia-x64-cast
TBR=cr-fuchsia+bot@chromium.org

Change-Id: I7817cf48888aeb185bb7210cd9406ff96ddd6c62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627862Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#662887}

build/fuchsia/linux.sdk.sha1

-8912665382470429216
+8912639898317211552
\ No newline at end of file

build/fuchsia/mac.sdk.sha1

-8912666789218794960
+8912640165921142128
\ No newline at end of file