GitLab

The component lookup logic uses dirname(source_path), so we should not
use directories as source_paths.

Bug: None
Change-Id: Ibbfd6670a68ce5016912b4ad1390226cbc25b339
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2484045
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818468}