Remove unused cookie exceptions in brave-core/cookie_settings_base.cc

[ryanbr]

Description

Since landing ephemeral storage, was asked to review to changes in https://github.com/brave/brave-core/blob/master/chromium_src/components/content_settings/core/common/cookie_settings_base.cc

Fixes for brave/brave-core#5960 ref: #10494 (Fixes Twitch clips on Reddit)

• Embedded Twitch videos played back fine in reddit.com

and brave/brave-core#6553 ref: #11532 (Fix login issue on bitbucket.org)

• Was able to login to bit bucket, without it failing.

The rest of the fixes in https://github.com/brave/brave-core/blob/master/chromium_src/components/content_settings/core/common/cookie_settings_base.cc are still needed

Tested in a ci brave build with all cookie exceptions removed.

[ryanbr]

Retested to be sure on the updated build.

https://www.reddit.com/r/LivestreamFail/comments/lf2y48/cyberpunk_strikes_again_gta_rp/ (Stream plays back with no error)

and https://www.bitbucket.org worked without issue.