Removed ntp tile outline

[simonhong]

fix brave/brave-browser#14802

Resolves

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• 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, npm run lint, 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/Custom-Headers
  • 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:

[bsclifton]

I don't think we need this anymore - looks fixed w/ Chromium 90. @simonhong can you verify? Tiles PR was in 1.23 which will also feature Chromium 90

[simonhong]

@bsclifton I confirmed that latest nightly (c90) still has this issue.

[bsclifton]

Works great! 😄

[simonhong]

re-run macos CI only. others are fine with previous run.

[bsclifton]

Looking at the change a bit further (and trying things with dev tools). The right kind of fix might be to instead specify outline:none for the anchor tag. unset does work but feels like when you want it to fall back to default (versus not show at all)

[bsclifton]

Perfect 😄

edit: found a problem maybe 10 seconds after approving lol

I think the first line edited (removal of unset) should be kept. I think we just need the 2nd line of change

[bsclifton]

see comment (my bad)

[bsclifton]

Looks great! 😄

[simonhong]

Two below browser tests are failed only on linux and both are definitely not related with this PR's change. Merged.
BraveNavigatorPluginsFarblingBrowserTest.FarbleNavigatorPluginsReset
RewardsContributionBrowserTest.AutoContributionMultiplePublishersUphold