Run securecookie normalization script #11870

@Hainish Please run this script: https://gist.github.com/koops76/14db6c6c1250eadc98644cff51e7add7.

I'm not making this a pull request because it changes 5354 files. Travis would probably explode. 😁

Please note that if ruleset whitelist cleanup is not run before running this script, it will throw errors on SHA256 mismatches.

After the script is run, merge #11872.