Fix 6434: Using vpython for lint

[jumde]

fixes #6434

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Requested a security/privacy review as needed.
• Public documentation has been updated as necessary. 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-Protection-Mode
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection

Test Plan:

1. Uninstall httplib2 pip uninstall httplib2
2. Update package.json to checkout httplib2_lint in brave-core
3. run: npm run init
4. in brave-core: git checkout -b TEMP_LINT
5. run: npm run lint and verify one error shows up

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions.

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.

[bsclifton]

When running (after both npm run init and npm run sync -- --all), I get the following (macOS):

clifton@iMac-Pro (httplib2 *=) $ npm run lint

> [email protected] lint /Users/clifton/Documents/brave-browser3
> node ./scripts/commands.js lint

/Users/clifton/Documents/brave-browser3/src/brave: vpython /Users/clifton/Documents/brave-browser3/scripts/lint.py --project_root=/Users/clifton/Documents/brave-browser3/src --base_branch=origin/master
Traceback (most recent call last):
  File "/Users/clifton/Documents/brave-browser3/scripts/lint.py", line 15, in <module>
    import git_cl
  File "/Users/clifton/Documents/brave-browser3/vendor/depot_tools/git_cl.py", line 46, in <module>
    import gerrit_util
  File "/Users/clifton/Documents/brave-browser3/vendor/depot_tools/gerrit_util.py", line 37, in <module>
    from six.moves import urllib
ImportError: No module named six.moves

[bsclifton]

Re-ran after your last change; worked great! 😄