[journey] remove deps from proto_library

I will deprecate deps in proto_library for improved build throughput.
And we don't need to have empty deps here.

Bug: 938011
Change-Id: Ie1b959cdb06d11d8ad3bcc2c4dd761cc08793e61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514339
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639857}
1 file changed