Fixes dnd for url bar icon

[NejcZdovc]

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).
• 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. (Ask a Brave employee to help if you cannot access this document.)

Resolves #12476

Auditors:

Test Plan:

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[codecov-io]

Codecov Report

Merging #12515 into master will increase coverage by 0.02%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master   #12515      +/-   ##
==========================================
+ Coverage   55.91%   55.93%   +0.02%     
==========================================
  Files         278      278              
  Lines       26983    26969      -14     
  Branches     4363     4361       -2     
==========================================
- Hits        15087    15086       -1     
+ Misses      11896    11883      -13

Flag	Coverage Δ
#unittest	55.93% <40%> (+0.02%)	⬆️

Impacted Files	Coverage Δ
js/actions/windowActions.js	5% <ø> (+0.04%)	⬆️
js/constants/windowConstants.js	100% <ø> (ø)	⬆️
app/renderer/reducers/frameReducer.js	57.5% <ø> (+2.78%)	⬆️
app/renderer/components/navigation/urlBarIcon.js	72.3% <0%> (-0.42%)	⬇️
js/dnd.js	28.72% <66.66%> (+1.54%)	⬆️

[cezaraugusto]

heads-up at one point I got this error:

[7157:775:0105/180803.419843:ERROR:CONSOLE(0)] "(WEBUI context) http://localhost:8080/gen/app.entry.js:96566: Uncaught Error: function () {
        dnd.onDragEnd();
      } could not be cloned.{Error: function () {
        dnd.onDragEnd();
      } could not be cloned.
    at EventEmitter.ipc.on (http://localhost:8080/gen/app.entry.js:96566:34)
    at emitTwo (extensions::event_emitter:105:13)
    at EventEmitter.emit (extensions::event_emitter:193:7)
    at EventEmitter.ipcRenderer.emit (extensions::ipc_utils:35:22)}", source: chrome://brave/Users/cezaraugusto/dev/browser-laptop/app/extensions/brave/index-dev.html (0)

I wasn't able to replicate that again and since the above didn't break anything I think we're ok for now.

[cezaraugusto]

master ec24079
0.21.x be72eb4
0.20.x 70b6585