Fix emma_coverage=true GN gen failure

Was getting a few: ERROR Input to target not generated by a dependency.

Bug: 843307
Change-Id: I58ad10e74842b6f1df9e53cc5b592d6169cc8553
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1591947
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656488}
1 file changed