Roll Fuchsia SDK from 891321448654 to 891318578305

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: If09cbb1d81e9e95579d6ef3e813766902a0d6fca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617886Reviewed-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@{#661048}

build/fuchsia/linux.sdk.sha1

-8913214486540616192
+8913185783052626352
\ No newline at end of file

build/fuchsia/mac.sdk.sha1

-8913219563458029600
+8913208442624236768
\ No newline at end of file