Fixed display of text for new tabs

[srirambv]

Test plan

#7754 (comment)

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

• Describe the issue you encountered:
  NewTab retains about:newtab text until mouse pointer is moved away from tab

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Windows 10 x64

• Brave Version (revision SHA):
  Brave 0.14.0
  rev 7dfeeb0

• Steps to reproduce:

  1. Do a clean install of 0.14.0
  2. Set new tab opens to blank page in settings
  3. Use mouse/trackpad to click on the new tab button so that the pointer is over the new tab
  4. Tab text remains about:newtab until the mouse pointer is moved away from newly created tab
     It is the same with opening a new tab/private tab/session tab using keyboard shortcut with the pointer right next to the + button

• Actual result:
  New tabs text doesn't change until mouse pointer is moved away from the newly created tab

• Expected result:
  Should should New Tab like before

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes

• Is this an issue in the currently released version?
  No

• Can this issue be consistently reproduced?
  Yes

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:
  

• Any related issues:
  cc: @cezaraugusto @bsclifton

[luixxiul]

I think this is the same issue which I pinged @NejcZdovc somewhere. @NejcZdovc do you remember?

[NejcZdovc]

@luixxiul is this issue, but I think it's not the same #7606