Roll Fuchsia SDK from 459b6dcdb04d to 912a4908d4c4

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: Ib099f5c86bd17dd4b5dd136fd0ac30397e8f09fd
Reviewed-on: https://chromium-review.googlesource.com/c/1357661Reviewed-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@{#612915}

build/fuchsia/linux.sdk.sha1

-459b6dcdb04d7f2a8959e755e88a466cc4aebffc
\ No newline at end of file
+912a4908d4c47f9cdeacb89e1eb195849fe689fa
\ No newline at end of file

build/fuchsia/mac.sdk.sha1

-7e8dce5f7c05afb3f411669db3c2d74727e99b53
\ No newline at end of file
+3be233eb71e004ec300b6e2cab342e1631f85505
\ No newline at end of file