Follow up of #15906 - Implement 1p Ephemeral Storage Functionality (functionality)

[GeetaSarvadnya]

Description

Follow up of #15906 - Implement 1p Ephemeral Storage Functionality (functionality)

Steps to Reproduce

1. new profile
2. launch Brave
3. added [*.]yandex.com to Always clear cookies when windows are closed, in brave://settings/cookies
4. loaded yandex.com/internet in 5 new tabs
5. noted the value for yandexuid was 9823635641635263673, across all 5 tabs
6. closed all tabs (but NOT the browser)
7. loaded yandex.com/internet again in a single tab
8. noted the value for yandexuid is still same 9823635641635263673

Actual result:

value for yandexuid is same is step 5 and step 8

Expected result:

value for yandexuid should be different in step 5 and step 8

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.32.82 Chromium: 95.0.4638.54 (Official Build) dev (64-bit)
Revision	d31a821ec901f68d0d34ccdbaea45b4c86ce543e-refs/branch-heads/4638@{#871}
OS	Windows 10 Version 21H1 (Build 19043.1288)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• 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? 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 @goodov

[GeetaSarvadnya]

Looks like windows specific issue as it worked for @stephendonner on both macOS and Linux. @stephendonner Could you please test this issue on your windows machine?

[GeetaSarvadnya]

I am getting the same result with/without enabling 1p flag via brave://flags.

[stephendonner]

@GeetaSarvadnya sorry, the flag is actually #brave-first-party-ephemeral-storage (NOT 1p); when I set that (sorry for omitting that from my verification steps!), open 5 tabs with yandex.com/internet, note the yandexid (they are all the same) and then close the last yandex.com/internet tab, and open a new one -- same browser session -- I get a new yandexid.

[GeetaSarvadnya]

Works as expected hence closing the issue.