Fix for domain blocking iframes (uplift to 1.23.x)

[brave-builds]

Uplift of #8389
Resolves brave/brave-browser#14826

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• 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]

post-init failed due to audit_deps as per https://ci.brave.com/job/pr-brave-browser-pr8389_mpilgrim_main_frame_1.23.x-post-init/1/execution/node/144/log/ which is a known failure/warning and unrelated to this specific PR.

test-browser failed on macOS as per https://ci.brave.com/job/pr-brave-browser-pr8389_mpilgrim_main_frame_1.23.x-macos/1/execution/node/241/log/ & https://ci.brave.com/job/pr-brave-browser-pr8389_mpilgrim_main_frame_1.23.x-macos/1/execution/node/244/log/. However, this is a known failure and unrelated to this specific PR.

14:05:43  5 tests crashed:
14:05:43      BraveStatsUpdaterBrowserTest.StatsUpdaterMigration (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:275)
14:05:43      BraveStatsUpdaterBrowserTest.StatsUpdaterSetsFirstCheckPreference (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:154)
14:05:43      BraveStatsUpdaterBrowserTest.StatsUpdaterStartupPingWithDefaultReferralCode (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:229)
14:05:43      BraveStatsUpdaterBrowserTest.StatsUpdaterStartupPingWithReferralCode (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:327)
14:05:43      BraveStatsUpdaterBrowserTest.StatsUpdaterThresholdSetsFirstCheckPreference (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:191)

macOS failed due to test-browser as per https://ci.brave.com/job/pr-brave-browser-pr8389_mpilgrim_main_frame_1.23.x-linux/1/execution/node/241/log/ & https://ci.brave.com/job/pr-brave-browser-pr8389_mpilgrim_main_frame_1.23.x-linux/1/execution/node/244/log/. However, this is a known failure and unrelated to this specific PR.

13:33:53  7 tests crashed:
13:33:53      BraveAdsBrowserTest/BraveAdsUpgradeBrowserTest.UpgradePath/PreferencesForVersion072WithRewardsAndAdsEnabled_ForSupportedLocale_ForNewlySupportedLocale_RewardsShouldBeEnabled_AdsShouldBeDisabled (../../brave/components/brave_ads/browser/ads_service_browsertest.cc:1000)
13:33:53      BraveAdsBrowserTest/BraveAdsUpgradeBrowserTest.UpgradePath/PreferencesForVersion072WithRewardsAndAdsEnabled_ForSupportedLocale_ForUnsupportedLocale_RewardsShouldBeEnabled_AdsShouldBeEnabled (../../brave/components/brave_ads/browser/ads_service_browsertest.cc:1000)
13:33:53      BraveStatsUpdaterBrowserTest.StatsUpdaterMigration (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:275)
13:33:53      BraveStatsUpdaterBrowserTest.StatsUpdaterSetsFirstCheckPreference (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:154)
13:33:53      BraveStatsUpdaterBrowserTest.StatsUpdaterStartupPingWithDefaultReferralCode (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:229)
13:33:53      BraveStatsUpdaterBrowserTest.StatsUpdaterStartupPingWithReferralCode (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:327)
13:33:53      BraveStatsUpdaterBrowserTest.StatsUpdaterThresholdSetsFirstCheckPreference (../../brave/browser/brave_stats/brave_stats_updater_browsertest.cc:191)

[kjozwiak]

Uplift into 1.23.x approved after deliberating with @brave/uplift-approvers. QA has verified the PR on Nightly as per brave/brave-browser#14826 (comment).