remove BraveHttpsByDefaultRolloutStudy

[kjozwiak]

Win x64 verification

Quick Note: As per https://github.com/brave/brave-variations/issues/1103#issue-2384868693, we've enabled HttpsByDefault by default via https://github.com/brave/brave-browser/issues/31104.

Nightly

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

Brave | 1.69.83 Chromium: 127.0.6533.26 (Official Build) nightly (64-bit)
-- | --
Revision | 82eef43ce82af220a70b396674ecbd7010b5cb7c
OS | Windows 11 Version 23H2 (Build 22631.3810)

• launched 1.69.83 Chromium: 127.0.6533.26 and ensured that there's no studies being listed under brave://version
• ensured that the new HTTPS drop down context menu via the shields panel was added with the following choices
  • Only connect with HTTPS, Upgrade connections to HTTPS (Defualt) and `Don't upgrade HTTP connection
• ensured that the new HTTPS settings are being added via brave://settings/shields with the following choices:
  • Strict, Standard and Disabled

Example	Example	Example

BETA

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

Brave | 1.68.111 Chromium: 127.0.6533.26 (Official Build) beta (64-bit)
-- | --
Revision | 635ef01f9ccdcb2f2f1006cb9b2c0f261df986bc
OS | Windows 11 Version 23H2 (Build 22631.3810)

• launched 1.68.111 Chromium: 127.0.6533.26 and ensured that there's no studies being listed under brave://version
• ensured that the new HTTPS drop down context menu via the shields panel was added with the following choices
  • Only connect with HTTPS, Upgrade connections to HTTPS (Defualt) and `Don't upgrade HTTP connection
• ensured that the new HTTPS settings are being added via brave://settings/shields with the following choices:
  • Strict, Standard and Disabled

Example	Example	Example

Release

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

Brave | 1.67.123 Chromium: 126.0.6478.126 (Official Build) (64-bit)
-- | --
Revision | fc7619ef621fe4e6a0fa8b16c718f78ffc97a861
OS | Windows 11 Version 23H2 (Build 22631.3810)

• launched 1.67.123 Chromium: 126.0.6478.126 and ensured that there's no studies being listed under brave://version
• ensured that the new HTTPS drop down context menu via the shields panel was added with the following choices
  • Only connect with HTTPS, Upgrade connections to HTTPS (Defualt) and `Don't upgrade HTTP connection
• ensured that the new HTTPS settings are being added via brave://settings/shields with the following choices:
  • Strict, Standard and Disabled

Example	Example	Example