[Desktop] Fingerprint values for Web audio is not the same on both pages with Shields down, follow up of #9186

[GeetaSarvadnya]

Description

Follow up of 9186 - with shields down, FP values for Web audio is NOT same on both pages

Steps to Reproduce

1. Clean profile 1.10.90
2. Visit https://dev-pages.bravesoftware.com/farbling.html
3. Make shield down and Generate FP values
4. Visit https://dev-pages.brave.software/farbling.html
5. Make shield down and Generate FP values
6. Look for Web audio values for both pages 2 and 4
7. Web audio values are different in both pages

Actual result:

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

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

Expected result:

As per the comments #9186 (comment) with shields down, FP values for Web audio should be same on both pages

Reproduces how often:

Always

Brave version (brave://version info)

Brave	1.10.90 Chromium: 83.0.4103.97 (Official Build) (64-bit)
Revision	326d148b9655369b86498d9ecca39f63dd2bdd2d-refs/branch-heads/4103@{#657}
OS	Windows 10 OS (Build 10240.17443)

Version/Channel Information:

• Can you reproduce this issue with the current release? Not sure
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the dev channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

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

Miscellaneous Information:

cc: @brave/legacy_qa @pes10k

[btlechowski]

@pes10k Is this a dupe of #9194, which implements the ability to turn off fingerprinting?

[pes10k]

@btlechowski I dont think this is a dupe, this looks like a bug, related to #10223

[pes10k]

cc @pilgrim-brave

[LaurenWags]

labeling as QA/Blocked for now as this requires an uplift to test

[pes10k]

re release-notes, i think it'd be sufficient to say "non-critical memory issue was fixed related to farbling and fingerprint randomization" or similar

[LaurenWags]

awesome, thanks for the suggestion re: release notes blurb @pes10k 😄

[GeetaSarvadnya]

Verification passed on

Brave | 1.11.73 Chromium: 83.0.4103.106 (Official Build) dev (64-bit)
-- | --
Revision | ce7134bb3d95141cd18f1e65772a4247f282d950-refs/branch-heads/4103@{#694}
OS | Windows 10 OS Version 1903 (Build 18362.900)

• Verified STR from the description

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

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

---

Verified passed with

Brave | 1.11.78 Chromium: 83.0.4103.116 (Official Build) dev (64-bit)
-- | --
Revision | 8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{#716}
OS | macOS Version 10.14.6 (Build 18G3020)

Reproduced the issue in 1.10.x:

Verified WebAudio values the same for both pages when shields down in 1.11.x:

---

Verified passed with

Brave	1.11.84 Chromium: 83.0.4103.116 (Official Build) dev (64-bit)
Revision	8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{#716}
OS	Linux

• Verified STR from description