The parsing logic for OWNERS files included via "file:" lines currently
rejects inline comments (e.g. "foo@example.com  # for foo.cc"), while
the normal OWNERS parsing logic correctly ignores such inline comments.
This CL makes the inline case ignore inline comments too.

Bug: 995474
Change-Id: I6f30554daf0a5f63b81719dced44f59187707eaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1769603Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>