[Chromecast] Point fuchsia to correct dependency

BUG=NONE
TEST=CQ

Change-Id: Icf72f2bf44b3078ac92e201a3cc02cb1c9074059
Reviewed-on: https://chromium-review.googlesource.com/940533


Commit-Queue: Mina Almasry <almasrymina@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539600}