Go back button is given "disabled" class after opening a page on the new tab page

[luixxiul]

Describe the issue you encountered: Go back button is given "disabled" class after opening a page on the new tab page.

Expected behavior: the class should be removed

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

• Brave Version: master branch

• Steps to reproduce:
  1 Clear your brave folder
  2 Start the browser, and make sure the new tab page is opened
  3 Click the URL bar
  4 Type github
  5 Select github.com from Top Site in the autocomplete list
  6 GitHub is opened
  7 Click the disabled "Go Back" button
  8 The new tab page is opened
  9 Click the enabled "Go Forward" button
  10 GitHub is reopened, and the disabled "Go Back" button is enabled this time

• Any related issues:

[bsclifton]

Yikes- this is a bad one. Glad you caught it, @luixxiul 😄 (I had sworn I saw this, but couldn't repro and thought I was going crazy)

[luixxiul]

I'm not sure if this is related with the new tab page because I can reproduce the same issue by setting a homepage and restarting the browser.

[bbondy]

Great steps to reproduce @luixxiul, thanks 👍