Regression : Users cannot allow mixed-content in a private tab

[alexwykoff]

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

Describe the issue you encountered:
While verifying #3795 it was found that I cannot allow for mixed content on the private tab. The 'secure connection' message is displayed instead.

Expected behavior:
I should be able to allow mixed content in a private tab and it should behave independently from the normal tabs.

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Confirmed on all.
• Brave Version:
  0.12.1
• Steps to reproduce:
  1. Open a private tab.
  2. Navigate to https://mixed-script.badssl.com/
  3. Attempt to allow mixed content by clicking on the blue lock in the address bar.
• Screenshot if needed:
• Any related issues:

[alexwykoff]

cc @diracdeltas

[diracdeltas]

This is intended

[diracdeltas]

will probably be fixed as part of #1824

[bbondy]

Small triage thing that can help, when closing issues without landed code, pls clear milestone. Thanks!

[diracdeltas]

@bbondy will do next time