GitLab

Fixed various bugs, including exception on stacktrace and unnamed variable in git parser.
Changed the algorithm to use file_path only instead of file_name.
Removed URL links from the result.
Added commit message to the final result.
Updated OWNERS.

NOTRY=true

Review URL: https://codereview.chromium.org/478763003

Cr-Commit-Position: refs/heads/master@{#291698}