Tor windows should be closed when Tor is disabled

[darkdh]

When users go to brave://settings/extensions and disable Tor through Private window with Tor switch, existing Tor windows should be automatically closed because those windows are no longer abled to connect to Tor network.

[stephendonner]

Verified PASSED using

Brave	1.29.8 Chromium: 92.0.4515.101 (Official Build) nightly (x86_64)
Revision	edb73f4fb624e2ea0cb6f5cc39c9e317ecd3535b-refs/branch-heads/4515@{#1536}
OS	macOS Version 11.4 (Build 20F71)

Steps:

1. new profile
2. launched Brave
3. opened 2 New private window with Tor windows
4. opened 2 New Private window windows
5. clicked on Create a New Profile
6. opened 2 New Private window windows and 2 New private window with Tor windows
7. loaded brave://settings/?search=onion
8. toggled Private window with Tor to Off
9. confirmed all 4 New private window with Tor windows were automatically closed
10. confirmed all 4 New Private window windows remained

---

Verification passed on

Brave	1.29.60 Chromium: 92.0.4515.131 (Official Build) beta (64-bit)
Revision	6b8d6c56ce21e38a72f7c4becb5abc1fa5134f29-refs/branch-heads/4515@{#1933}
OS	Ubuntu 18.04 LTS

Verified the above tes plan

Before disabling tor:

After disabling tor, verified all tor windows were closed:

---

Verification passed on

Brave | 1.29.60 Chromium: 92.0.4515.131 (Official Build) beta (64-bit)
-- | --
Revision | 6b8d6c56ce21e38a72f7c4becb5abc1fa5134f29-refs/branch-heads/4515@{#1933}
OS | Windows 10 OS Version 2009 (Build 19043.1165)

• Verified the description from the issue Tor windows should be closed when Tor is disabled #16959 (comment)

Confirmed all the opened Tor windows are closed when the toggle Private window with Tor is disabled under brave://settings/extensions