This is a fork of chromium used to make merging changes into cronet easy.
2b1f7cc introduced LICENSES directory. AUR rejects commits containing directories with an error like this:
remote: error: The following error occurred when parsing commit
remote: error: 2b1f7cc9ea70119109e9ffd559c27b449ff83546:
remote: error: the repository must not contain subdirectories
remote: error: hook declined to update refs/heads/master
Hence, commits like that are omitted from this fork. Use merge-upstream script to merge changes from the upstream.