Use cname url when blocking (uplift to 1.22.x)

[brave-builds]

Uplift of #8262
Resolves brave/brave-browser#14756

Pre-approval checklist:

• You have tested your change on Nightly.
• This contains text which needs to be translated.
  • There are more than 7 days before the release.
  • I've notified folks in #l10n on Slack that translations are needed.
• The PR milestones match the branch they are landing to.

Pre-merge checklist:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.

Post-merge checklist:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

Restarting iOS due to build failing as per https://ci.brave.com/job/pr-brave-browser-pr8262_cname-block-regression_1.22.x-ios/1/execution/node/157/log/.

12:16:12  FAILED: obj/ios/third_party/material_internationalization_ios/material_internationalization_ios/UIImage+MaterialRTL.o 

Restarting pre-init as pylint-report failed as per https://ci.brave.com/job/pr-brave-browser-pr8262_cname-block-regression_1.22.x-pre-init/1/execution/node/136/log/

12:08:31  + rm -f pylint-report.txt
12:08:31  + npm run pylint-report
12:08:31  npm ERR! missing script: pylint-report

post-init failed audit-deps due to a known failure as per https://ci.brave.com/job/pr-brave-browser-pr8262_cname-block-regression_1.22.x-post-init/1/execution/node/144/log/. However, this doesn't block uplift as it's not related to this specific PR.

[kjozwiak]

Restarting pre-init as pylint-report as it failed again on the same spot as before. Used TERMINATE_NODE & WIPE_WORKSPACE this time around.

[2021-03-17T20:42:09.779Z] + rm -f pylint-report.txt
[2021-03-17T20:42:09.779Z] + npm run pylint-report
[2021-03-17T20:42:10.715Z] npm ERR! missing script: pylint-report

[kjozwiak]

Uplift into 1.22.x approved after deliberating with @brave/uplift-approvers. QA has verified the PR on Nightly as per #8262 (comment).