Plugins FP blocking not working correctly when FP set to Standard

[LaurenWags]

Description

Found while testing #9435

When testing on our QA test pages for FP farbling, I noticed that if FP is set to Standard, "Plugins" does not appear to be working correctly. Note, if you set FP to Strict, this is working as expected.

This does not occur in 1.12.x, but does occur in 1.13.x and 1.14.x

Per discussion with @pes10k logging this and tagging @pilgrim-brave to hopefully take a look.

Steps to Reproduce

1. Clean profile 1.13.x, do not adjust shields
2. Navigate to https://dev-pages.bravesoftware.com/farbling.html (and/or https://dev-pages.brave.software/farbling.html)
3. Generate Fingerprints
4. Look at the line for Plugins

Actual result:

This Page and Remote Frame values are the same, but Local Frame value is different.

Expected result:

All three, This Page, Local Frame, and Remote Frame, should the the same on the Plugins line on a given page (but these values should be different between the two pages) as they do in 1.12.x:

When retesting, confirm Strict setting in shields still works as expected.

Reproduces how often:

easily

Desktop Brave version:

Brave	1.13.73 Chromium: 84.0.4147.125 (Official Build) dev (64-bit)
Revision	d0784639447f2e10d32ebaf9861092b20cfde286-refs/branch-heads/4147@{#1059}
OS	macOS Version 10.14.6 (Build 18G3020)

Version/Channel Information:

• Can you reproduce this issue with the current release? no, does not reproduce on 1.12.x
• Can you reproduce this issue with the beta channel? yes, 1.13.x
• Can you reproduce this issue with the nightly channel? yes 1.14.x

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @pes10k @brave/legacy_qa @rebron

Note - tagged as OS/Android since original issue was also tagged as Android, please remove if this does not apply.

[GeetaSarvadnya]

Reproduced in Windows 10 x64 - 1.13.77

[GeetaSarvadnya]

Verification passed on

Brave | 1.15.56 Chromium: 85.0.4183.102 (Official Build) dev (64-bit)
-- | --
Revision | ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS | Windows 10 OS Version 1903 (Build 18362.1016)

• Verified the STR from the description and ensured that the Plugin value is the same for This Page, Local Frame, and Remote Frame

https://dev-pages.bravesoftware.com/farbling.html	https://dev-pages.brave.software/farbling.html

---

Verification passed on

Brave	1.15.56 Chromium: 85.0.4183.102 (Official Build) dev (64-bit)
Revision	ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS	Ubuntu 18.04 LTS

• Verified the STR from the description and ensured that the Plugin value is the same for This Page, Local Frame, and Remote Frame

https://dev-pages.bravesoftware.com/farbling.html	https://dev-pages.brave.software/farbling.html

---

Verification PASSED on macOS 10.15.6 x64 using the following build:

Brave | 1.15.56 Chromium: 85.0.4183.102 (Official Build) dev (64-bit)
-- | --
Revision | ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS | macOS Version 10.15.6 (Build 19G73)

Verified the STR as per #11278 (comment) and ensured that the Plugin value is the same for This Page, Local Frame, and Remote Frame when using Fingerprinting blocked (Standard) as per the following:

https://dev-pages.bravesoftware.com/farbling.html	https://dev-pages.brave.software/farbling.html

Verified the STR as per #11278 (comment) and ensured that the Plugin value is the same for This Page, Local Frame, and Remote Frame when using Fingerprinting blocked (strict, may break sites) as per the following:

https://dev-pages.bravesoftware.com/farbling.html	https://dev-pages.brave.software/farbling.html

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.15.54 x64 beta build

• Verified plugins value is the same on both the pages with FP set to block all and block cross-site fingerpriting

https://dev-pages.bravesoftware.com/farbling.html (Block cross-site)	https://dev-pages.bravesoftware.com/farbling.html (Block all)	https://dev-pages.brave.software/farbling.html (Block cross-site)	https://dev-pages.brave.software/farbling.html (Block all)

---

Verification passed on Samsung Tab A with Android 10 running 1.15.54 x64 beta build

• Verified plugins value is the same on both the pages with FP set to block all and block cross-site fingerpriting

https://dev-pages.bravesoftware.com/farbling.html (Block cross-site)	https://dev-pages.bravesoftware.com/farbling.html (Block all)	https://dev-pages.brave.software/farbling.html (Block cross-site)	https://dev-pages.brave.software/farbling.html (Block all)