Run of proto_export.py

No other changes.

Change-Id: I6c23a9c0d2ad96bc36b72e54dd7bff8936610acc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3063742


Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Tony Yeoman <tby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#908295}