Roll Fuchsia SDK from 9c42a5f9c79c to 785befe984ce

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_audio;luci.chromium.try:fuchsia_x64_cast_audio
TBR=cr-fuchsia+bot@chromium.org

Change-Id: Ia5b169dae58a01205c35b10af4ff968383ad79b8
Reviewed-on: https://chromium-review.googlesource.com/1196923
Commit-Queue: Fuchsia SDK Autoroller <fuchsia-sdk-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: Fuchsia SDK Autoroller <fuchsia-sdk-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#587574}

build/fuchsia/sdk.sha1

-9c42a5f9c79c298b5e13a815a988e8addde27da1
\ No newline at end of file
+785befe984ce9119b1dae7b3696bff178a524756
\ No newline at end of file