Fix linux_symbols not having a dependency on ANGLE's symbols.

This caused ANGLE's symbols to not be generated and uploaded with
official builds.

BUG=988958,988444

Change-Id: I428e5664755bb969fbe771c2a9d303f90d26a017
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724840
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682379}