Disable BraveRoundTimeStamps (5% Release)

[atuchin-m]

Resolves #1214

Nightly & Beta: 100%
Release: 5%

Disabling the feature just returns the code to the upstream state, so it's relatively safe.
Just to be sure let's start with 5% now and go to 100% the new day.

[github-actions]

✅ Test Seed Generated Successfully

To apply the test seed:

1. Desktop: Launch the browser with --variations-pr=1215.
   Android: Set the command line to --variations-pr=1215 in debug menu, restart the browser.
   iOS: Set Variations PR to 1215 in Brave Core Switches debug menu, restart the browser.
2. Wait 5-10 seconds to fetch the seed.
3. Restart the browser to apply the seed.
4. Ensure Active Variations section at brave://version starts with the expected seed version (see below).

Seed Details

Parameter	Value
Version	pull/1215@259040b416c2bfec86558b134985e10ddb6c8aae
Uploaded	Tue, 24 Sep 2024 09:59:33 GMT
PR commit	d374499
Base commit	e7bfa3e
Merge commit	259040b
Serial number	74c79afedd051b00121cacd9df78d3c7

[kjozwiak]

Windows x64 verification(s):

Release - BraveRoundTimeStampsReleaseStudy:Default

Verification PASSED on Win 11 x64 using the following build(s):

Brave | 1.70.123 Chromium: 129.0.6668.89 (Official Build) (64-bit)
-- | --
Revision | 7c1bbf03546a64d969d010808e4f5c99fdf343bb
OS | Windows 11 Version 23H2 (Build 22631.4249)

• launched/re-launched 1.70.123 Chromium: 129.0.6668.89 using brave.exe --enable-logging=stderr --variations-pr=1215
• ensured that pull/1215@259040b416c2bfec86558b134985e10ddb6c8aae via brave://version under Active variations
• ensured that BraveRoundTimeStampsReleaseStudy:Default via brave://version
• opened https://open.spotify.com and played a really long playlist and switched to a different active tab
• let https://open.spotify.com run in the background for ~30min and noticed the Memory footprint increase to 11.3 GB
• switched over to https://open.spotify.com when the Memory footprint was at 11.3 GB and the tab crashed

Example	Example	Example

BETA - BraveWebViewRoundedCornersStudy:Enabled

Verification PASSED on Win 11 x64 using the following build(s):

Brave | 1.71.109 Chromium: 129.0.6668.89 (Official Build) beta (64-bit)
-- | --
Revision | 538f203fb4c3449f0684dbabd4ef6e777c4e4a3b
OS | Windows 11 Version 23H2 (Build 22631.4249)

• launched/re-launched 1.71.109 Chromium: 129.0.6668.89 using brave.exe --enable-logging=stderr --variations-pr=1215
• ensured that pull/1215@259040b416c2bfec86558b134985e10ddb6c8aae via brave://version under Active variations
• ensured that BraveWebViewRoundedCornersStudy:Enabled via brave://version
• opened https://open.spotify.com and played a really long playlist and switched to a different active tab
• let https://open.spotify.com run in the background for ~30min and the Memory footprint didn't increase past 250MB
• waited another ~30mins and started switching between https://open.spotify.com and a few other tabs without crashing

Example	Example	Example

[kjozwiak]

Uplift into main/production approved after deliberating with @brave/uplift-approvers. QA has verified the PR on BETA via 1.71.x as per #1215 (comment).