Fix#7398 - Resolves Delete and Cancel buttons not being shown when selecting items after searching history

[rahulsnkr]

Resolves brave/brave-browser#7398. Delete and cancel buttons now show up when selecting items after searching history. Attached a video of the feature working as expected.

search-history-brave.mp4

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:

[rahulsnkr]

Don't have permissions to request a review, so tagging instead - @petemill @karenkliu @bsclifton

[karenkliu]

LGTM :)

[rahulsnkr]

@karenkliu could you please merge the PR if everything looks good? I don't have the necessary permissions to do so.

[karenkliu]

We should wait on Pete's code review before merging.

[rahulsnkr]

@petemill could you please review?

[bsclifton]

This works great - matches the Chromium behavior exactly 😄 The search gets covered up by the X selected titlebar

[bsclifton]

@rahulsnkr sorry for the delay here - just wanted to give @petemill a chance to review 😄 He should be able to take a look soon! Thanks again for the patch (and for the quick fixup there!)