Remove top sites from NTP

[deeppandya]

Resolves brave/brave-browser#23118

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
• 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, 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:

[wchen342]

++

[kjozwiak]

Verification PASSED on Pixel 6 running Android 13 using the following build(s):

Brave | 1.41.64 Chromium: 103.0.5060.42 (Official Build) canary (32-bit)
--- | ---
Revision | de0d840bf9439c31bd86bf74f065c31fdf9b208d-refs/branch-heads/5060@{#667}
OS | Android 13; Build/TPB3.220513.017.B1

STR/Cases

• ensured that the Top Tiles being displayed under NTP on a clean install (you'll need to open a second tab due known issue)
• ensured that Show Top sites is enabled by default via Settings -> New Tab Page`
• ensured that the Top Tiles is displayed under the NTP after several restarts
• ensured that the Top Tiles are removed from NTP when disabled via Settings -> New Tab Page
• ensured that Top Tiles isn't visible after opening several NTP after being disabled
• ensured that Top Tiles isn't visible after restarting the browser several times after being disabled
• ensured there's no obvious issues when going between portrait & horizontal modes while Top Tiles are disabled
• ensured that Brave still remembers the most popular websites and still populates Top Tiles even though disabled
  • Example: Disable Top Tiles, visit several websites and than re-enable (they should be appearing via the Top Tiles
• ensured that all the context menu's are working as expected after Disabling and than Enabling the Top Tiles
  • Open in new tab in group, Open in Private tab, Open in other window, Download link, Remove
• ensured that Top Tilesare still visible/working when bothShow Background Images&Sponsored Images` are disabled
• ensured that two rows are being displayed when both Show Background Images & Sponsored Images are disabled
• ensured that Top Tiles can be disabled when both Show Background Images & Sponsored Images are disabled

Found brave/brave-browser#23474 while running through the above.

Upgrade Cases:

Upgrading from a version without the feature/toggle to the latest version with the above feature

• downloaded/installed 1.41.34 Chromium: 102.0.5005.78
• ensured that Show Top sites is not visible/available under Settings -> New Tab Page
• Upgraded to 1.41.64 Chromium: 103.0.5060.42
• ensured that Top Tiles are still visible under NTP
• ensured that Show Top sites is enabled via Settings -> New Tab Page

Disabling Top Sites and then upgrading and ensuring the setting persists/retains

• downloaded/installed 1.41.36 Chromium: 102.0.5005.78
• disabled Show Top sites from Settings -> New Tab Page and restarted re-launched the browser as specified
• Upgraded to 1.41.64 Chromium: 103.0.5060.42
• ensured that Top Top tiles are not being displayed under NTP
• ensured that Show Top sites is disabled via Settings -> New Tab Page

Example	Example	Example	Example

[distbit0]

Thanks so much for this!! Epic. Now I will have significantly less opportunity to be distracted by recommended sites displayed in top sites 👍

Mick appreciated. @kjozwiak