Mark a few build-time-only third-party README.chromiums as NOT_SHIPPED

To avoid them being listed in about:credits

BUG=332521

Review-Url: https://codereview.chromium.org/1935233002
Cr-Original-Commit-Position: refs/heads/master@{#391285}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c11f4b9a2e07b096d77ad038d42b83d9203eb0bf
1 file changed
tree: 6f414c54a853fece5b3f0d781ee27a494467eb3a
  1. lib/
  2. LICENSE
  3. OWNERS
  4. README.chromium