Include headers, not cc files

A test included a cc file which results in duplicate symbols
in the build which then broke certain builds. Most builds
were ok because linkers have the optimization to ignore
obj files which are not referenced by anything else. If anything
in the obj file is referenced everything changes though, and
everything in the obj file is considered.

Change-Id: I2ce961e341952847b20410746b58094ea9d7a3da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566309
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Auto-Submit: Daniel Bratell <bratell@opera.com>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651277}
1 file changed