[Security] shields not tracking blocked embedded scripts breaking Allow scripts once

[kjozwiak]

Description

As per the issue mentioned via brave/brave-core#11928 (comment), it looks like we're not keeping track of embedded scripts as per #20503 (comment). Blocking them works as expected but the Allow scripts once feature doesn't unblock the scripts due to us not tracking what was blocked.

Steps to Reproduce

1. loaded https://www.blizzard.com/en-gb and enabled Scripts blocked
2. once enabled, you'll notice that most of the website doesn't load (expected as scripts are being blocked)
3. click on Allow scripts once and you'll notice that scripts have been allowed but the website still doesn't work/load
4. disable Scripts blocked after you've clicked on Allow scripts once and notice that the website loads without any issues
5. enable Scripts blocked once more and notice that scripts are being blocked but it's showing 0 blocked next to Scripts

Actual result:

Expected result:

The Allow scripts once feature should work as expected and Brave should be tracking which embedded scripts are being block so users can pick which exact scripts are being blocked via the Allow scripts once feature within shields.

Reproduces how often:

100% reproducible using the STR/Cases mentioned above.

Brave version (brave://version info)

Brave | 1.36.73 Chromium: 98.0.4758.66 (Official Build) nightly (64-bit)
-- | --
Revision | db1b4001d5ce29f141297f260d2b778e000b85a3-refs/branch-heads/4758@{#762}
OS | Windows 11 Version 21H2 (Build 22000.438)

Brave | 1.34.81 Chromium: 97.0.4692.99 (Official Build) (64-bit)
-- | --
Revision | d740da257583289dbebd2eb37e8668928fac5ead-refs/branch-heads/4692@{#1461}
OS | Windows 11 Version 21H2 (Build 22000.438)

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? N/A (issue is related to shields)
• Does the issue resolve itself when disabling Brave Rewards? N/A
• Is the issue reproducible on the latest version of Chrome? N/A

Miscellaneous Information:

CCing @goodov @rebron @bsclifton @brave/legacy_qa

[stephendonner]

Verified PASSED using

Brave	1.35.98 Chromium: 98.0.4758.74 (Official Build) (x86_64)
Revision	d0fe1ec4df090cd3eb02b591228505e12ea476e9-refs/branch-heads/4758@{#935}
OS	macOS Version 11.6.1 (Build 20G224)

Steps:

1. new profile
2. loaded www.blizzard.com and enabled Scripts blocked
3. clicked on Allow scripts once and confirmed the page loaded
4. clicked on it again, and confirmed the rest of the page loaded

example	example	example

---

Verification passed on

Brave	1.35.98 Chromium: 98.0.4758.74 (Official Build) (64-bit)
Revision	d0fe1ec4df090cd3eb02b591228505e12ea476e9-refs/branch-heads/4758@{#935}
OS	Ubuntu 18.04 LTS

Verified Allow script once unblocks the scripts

---

Verified PASSED using

Brave	1.35.98 Chromium: 98.0.4758.74 (Official Build) (64-bit)
Revision	d0fe1ec4df090cd3eb02b591228505e12ea476e9-refs/branch-heads/4758@{#935}
OS	Windows 10 Version 20H2 (Build 19042.1466)

example	example	example