Always waiting for user interaction to fill the password form in Brave

[darkdh]

instead of using kFillOnAccountSelect which will show suggestions on page load

fix brave/brave-browser#1713

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
  • Windows
  • macOS
  • Linux
• Verified that these changes pass automated tests (npm test brave_unit_tests && npm test brave_browser_tests) on
  • Windows
  • macOS
  • Linux
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone

Test Plan:

1. Use built-in password manager to store credentials for twitter
2. Go to twitter.com
3. There is no password suggestions nor automatically filled password on page load
4. Click on username/password filed to show suggestions

1. Go to https://senglehardt.com/demo/no_boundaries/loginmanager/index.html
2. Save fake credentials
3. Follow the instructions of the website
4. The result should be Sniffed email: ? Sniffed password: ?

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

[diracdeltas]

lgtm

[bsclifton]

Nice!!