Closes #300: Fix lint errors

[dnarcese]

Pull Request checklist

• [ ] This PR includes thorough tests or an explanation of why it does not
• [ ] This PR includes a CHANGELOG entry or does not need one
• [ ] The UI tests are passing after this PR (./gradlew connectedAmazonWebViewDebugAndroidTest)
• [ ] I have considered adding QA labels on the associated issue (not this PR; qa-ready or qa-denied)

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@0f29a3f). Click here to learn what that means. The diff coverage is 66.66%.

@@            Coverage Diff            @@
##             master     #301   +/-   ##
=========================================
  Coverage          ?   21.41%           
  Complexity        ?      125           
=========================================
  Files             ?       91           
  Lines             ?     1877           
  Branches          ?      293           
=========================================
  Hits              ?      402           
  Misses            ?     1438           
  Partials          ?       37

Impacted Files	Coverage Δ	Complexity Δ
...ozilla/focus/widget/AccessibleGridLayoutManager.kt	0% <0%> (ø)	0 <0> (?)
...rg/mozilla/focus/toolbar/BrowserAppBarViewModel.kt	100% <100%> (ø)	4 <0> (?)

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