Fix crash when "New Private Window with Tor" is selected without a window open.

[sangwoo108]

When there's no open window, the "New Private Window with Tor" menu on the dock icon causes crash - technically, it's CHECK() failure. In order to fix this, pass Profile directly instead of Browser.

Resolves brave/brave-browser#37649

Submitter Checklist:

• I confirm that no security/privacy review is needed and no other type of reviews are needed, or that I have requested them
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally:
  • npm run test -- brave_browser_tests, npm run test -- brave_unit_tests wiki
  • npm run presubmit wiki, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

• Open browser
• Close window only - with cmd shift w
• Right click the brave icon
• Click "New Private Window With Tor"
• There should be no crash and Tor window should open.

[iefremov]

@sangwoo108 pls request uplifts

[kjozwiak]

Verification PASSED on macOS 14.4.1 x64 using the following build(s):

Brave | 1.67.25 Chromium: 124.0.6367.60 (Official Build) nightly (x86_64)
--- | ---
Revision | 9532ed663fa5eb013eb7b9840962b54ca6f2dbf4
OS | macOS Version 14.4.1 (Build 23E224)

Reproduced the original crash with 1.67.19 Chromium: 124.0.6367.60 using the STR/Cases outlined via #23126 (comment) as per the following:

Using the same STR/Cases as mentioned above, verified that Brave was not crashing when opening Tor windows via the Brave icon when all the other windows have been closed. Also ensured that Private & Normal windows are opening without issues.