GitLab

It is required to scan the entire file for potential copyright references,
as third-party code may appear anywhere in the file, so false positives
are unfortunately inevitable for comments containing the "C-word".

Add a note to the scanner message to provide a hint on that.

BUG=243570
TBR=torne@chromium.org

Review URL: https://codereview.chromium.org/1161943005

Cr-Commit-Position: refs/heads/master@{#333124}