Add a way to disable Tor via admin policy

[bbondy]

Test plan

1. Fresh install of Brave (clean profile)
2. Open regedit
3. For 64 bit, create the following keys:
   BraveSoftware\Brave
   under the existing key:
   HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\
   (for 32 bit, you can edit HKEY_LOCAL_MACHINE\SOFTWARE\Policies\)
4. Create a DWORD value at this path called TorDisabled and set the value as 1
5. Launch Brave
6. Verify Managed by your organization shows as the last item under the hamburger menu
7. If you click Managed by your organization, it should take you to brave://management
8. Verify no Tor options are shown in the UI
9. Exit Brave
10. Open the profile directory (%USERPROFILE%\AppData\Local\BraveSoftware\Brave-Browser\User Data)and look for the Tor executable (usually under a path like cpoalefficncklhjfpglfiplenlpccdb\1.0.6). It should NOT be there.

Original issue description

https://twitter.com/dlepi/status/1012732537196765189

Via a method like these work:
https://www.chromium.org/administrators/policy-list-3

[billrob]

I had to have my team uninstall this browser from our company's computers because of TOR.

[bbondy]

Thanks for letting us know @billrob. Note that it won't run without opt-in, but I know we need a way to completely disable it from even being installed, this will cover it.

[billrob]

@bbondy Security folks are at it again at my employer. Since it has the option to private browse with TOR, they won't have any of it. Boo.

[Jacalz]

I have this issue too, our School doesn't allow the use of VPN, proxys or Tor on our computers. Since it is opt in we can still use the browser if we want, but the use of Tor would be conflicting with their policy. Being able to completely remove it would be a great thing!

[Thymester]

+1

[notoriousturtle]

@BrendanEich

You’re losing users because your team is failing to provide an option to disable Tor. Tor is a serious security concern.