[Chromecast] Fix the compile error after enabling Lint on android things build.

Bug: internal b/118772329

Test: Locally build.
Change-Id: I0ae796dcbdb1fd17c8470e3653346a9bbe8ea30a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1613703
Commit-Queue: Ziyang Cheng <ziyangch@chromium.org>
Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679316}
5 files changed