Selected text in text fields is missing Look Up in context menu (macOS-only)

[cndouglas]

Did you search for similar issues before submitting this one?
Yes.

Describe the issue you encountered:
When right-clicking selected text in a text field on macOS, the Look Up option (dictionary definition) is not shown.

Expected behavior:
The Look Up option should be shown for selected text, as it is with normal text.

• Platform (Win7, 8, 10? macOS? Linux distro?):
  macOS 10.12.x

• Brave Version (revision SHA):
  0.12.15

• Steps to reproduce:

  1. Open a new Brave tab and navigate to any site with a text field.
  2. Activate the text field and type some text.
  3. Select the text.
  4. Right-click.
  5. Notice that there is no Look Up option.

• Screenshot if needed:
  

• Any related issues:
  None.

[bsclifton]

Fixed with #6545 which was merged into branch 0.13.1-branch.

Test Plan

1. Open a new Brave tab and navigate to any site with a text field.
2. Activate the text field and type some text.
3. Select the text.
4. Right-click.
5. Click the Look Up… option.
6. Make sure the definition is shown for the selected text.

[bbondy]

This isn't working consistently for me, I posted a follow up for it here:
#7043