Roll Fuchsia SDK from aca22aec6678 to 6c3c8c98f7b3

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: I246ac0c08f177e3a47610d2b363b1e149db3c378
Reviewed-on: https://chromium-review.googlesource.com/c/1475656Reviewed-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@{#632825}

build/fuchsia/linux.sdk.sha1

-aca22aec66780aac24fecb9d9bb8a77c80b8aa2d
+6c3c8c98f7b3184140d110083e0d32d2f6405aae
\ No newline at end of file

build/fuchsia/mac.sdk.sha1

-631bd6065a518a7b2da0417e36fb0306936184f6
+8c767248ffb52088b77fb5301eb72367ec7c9871
\ No newline at end of file