Make Tor integration compatible with NetworkService

[iefremov]

Test plan

See brave/brave-core#2647

Description

As part of migration we have to fix Tor - it doesn't work with enabled NetworkService. It seems that the reason is TorProfileServiceImpl::SetNewTorCircuitOnIOThread: URLRequestContext is not compatible with NetworkService.

[iefremov]

@darkdh @riastradh-brave FYI

[iefremov]

It is handy to use --enable-features=NetworkService to run Brave with NetworkService

[GeetaSarvadnya]

@darkdh When I launch brave using --enable-features=NetworkService flag. Open https://check.torproject.org/ in Tor windows doesn't connect to the tor network. But, as per the test plan brave/brave-core#2647, it should connect to tor network

[darkdh]

@GeetaSarvadnya Did you launch it using fresh profile? There is another issue blocking this test case (#5007), so before #5007 is fixed, we have to launch without --enable-features=NetworkService switch and wait for tor executable to be downloaded and then relaunch with --enable-features=NetworkService and connect to tor network

[btlechowski]

Verification passed on

Brave	0.67.111 Chromium: 75.0.3770.100 (Official Build) beta (64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Windows 7 Service Pack 1 (Build 7601.24494)

I was able to verify by using directions from brave/brave-core#2647 and #4312 (comment)
Steps used

1. Clean install
2. Run Brave
3. Open Tor Window
4. Wait till tor binaries are downloaded (Tor not working till browser restart if page is opened just after clean install #3512)
5. Open https://check.torproject.org/ in Tor Window and make sure that Tor is working.
6. Close Brave
7. Run brave with --enable-features=NetworkService parameter
8. Open Tor Window
9. Open https://check.torproject.org/ in Tor Window and make sure that Tor is working.

Encountered #5007 and #3512

Verification passed on

Brave	0.67.111 Chromium: 75.0.3770.100 (Official Build) beta(64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Ubuntu 18.04 LTS

Used above STR
Encountered #5007 and #3512

Verification PASSED on macOS 10.14.5 x64 using the following build:

Brave	0.67.115 Chromium: 76.0.3809.62 (Official Build) beta (64-bit)
Revision	7b77856b3aa34d72f246d12340fc1ded8b2c0e83-refs/branch-heads/3809@{#798}
OS	Mac OS X

• ensured that https://check.torproject.org/ loads in a Tor window without issues
• ensured that command + shift + r fetched a new IP (hard refresh)
• ensured that New Tor Connection for this Site fetched a new IP
• Reproduced Make component updater compatible with NetworkService #5007