Enable PermissionLifetime feature by default in code

[goodov]

The overall feature rollout looks fine, no any issues was found, so it's safe to enable the feature by default and remove it from Griffin after some time.

[stephendonner]

Verified PASSED using a subset of my testplans from #14126 with build

Brave	1.28.64 Chromium: 92.0.4515.81 (Official Build) nightly (x86_64)
Revision	dba3af0a9a48954c8b188bc641e651580b7cb7b5-refs/branch-heads/4515@{#1162}
OS	macOS Version 11.4 (Build 20F71)

Confirmed:

• feature is ENABLED by default
• feature is still ENABLED / DISABLED toggleable via brave://flags (if that needs to change, file a bug or let me know, and I will, @goodov 👍 )

default (enabled)	disabled	previous UI

Origin-based behavior, multiple tabs (location):

1. load hulu.com
2. log in
3. Give permission until I close this page
4. click Allow
5. confirm brave://settings/content/location shows Allow for Location
6. click Allow when prompted to install Widevine
7. play a video
8. open hulu.com in another tab
9. play a video
10. close either of the two open tabs
11. confirm brave://settings/content/location shows Allow for Location
12. close the remaining tab
13. confirm brave://settings/content/location now shows Ask before accessing (recommended) and has nothing under Block and Allow

example	example	example	example	example

24-hours positive test (23 hours) (microphone):

1. load https://permission.site/
2. click on Microphone
3. give permission for 24 hours and click Allow
4. confirm brave://settings/content shows Allow for Microphone
5. shut down Brave
6. set system clock forward by 23 hours
7. confirm brave://settings/content shows Allow for Microphone
8. load https://permission.site/
9. confirm you do NOT get re-prompted for microphone permissions when clicking on `Microphone

example	example	example	example	example

Allow forever (location):

1. load https://permission.site/
2. click on Location
3. give permission forever
4. confirm brave://settings/content/location shows Allow for Location
5. shut down Brave
6. set system clock forward by 2+ months
7. confirm brave://settings/content/location shows Allow for Location
8. load https://permission.site/ and click on Location again
9. confirm you get do NOT get reprompted for Location

example	example	example	example	example

Consecutive-revocation permissions (location):

1. launch Brave using --enable-logging=stderr --vmodule="*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*/bat-native-confirmations/*"=6,"*/brave_ads/*"=9,"*/brave_user_model/*"=6 --permission-lifetime-test-seconds=20
2. load https://permission.site
3. click on Location
4. give permission for 20 seconds
5. click on the lock icon next to permission.site in the URL bar
6. confirm Location is set to Allow
7. wait 10 seconds
8. open https://browserleaks.com/geo
9. give permission for 20 seconds
10. return to permissions.site
11. click on the lock icon; confirm you no longer see Location with any value
12. return to browserleaks.com/geo
13. click on the lock icon; confirm you no longer see Location with any value

example	example	example	example	example

[goodov]

feature is still toggleable via brave://flags

good catch! I missed that. Let's also clean this up.

[srirambv]

Verification passed on Oppo R5 with Android 11 running 1.28.99 x64 Beta build

• Verified Permission lifetime is enabled by default
• Verified permission prompt shows up on https://permission.site without having to enable/disable any flag
• Verified permission prompt for until I close this site, for 24 hours, for 1 week & forever works as expected for both allow and block
• Verified chrome://flags/#brave-permission-lifetime flag is available and can still be used to disable the setting

---

Verification passed on Samsung Tab A with Android 10 running 1.28.99 x64 Beta build

• Verified Permission lifetime is enabled by default
• Verified permission prompt shows up on https://permission.site without having to enable/disable any flag
• Verified permission prompt for until I close this site, for 24 hours, for 1 week & forever works as expected for both allow and block
• Verified chrome://flags/#brave-permission-lifetime flag is available and can still be used to disable the setting