Fix Chromium text in cert error page

[srirambv]

Description

Fix Chromium text in cert error page

Steps to Reproduce

1. Visit https://revoked.badssl.com/
2. Click on advanced
3. Shows Chromium

Actual result:

Expected result:

Should not have any Chromium branding on cert error page

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	0.63.55 Chromium: 74.0.3729.131 (Official Build) (64-bit)
Revision	518a41c1fa7ce1c8bb5e22346e82e42b4d76a96f-refs/branch-heads/3729@{#954}
OS	Linux

Version/Channel Information:

• Can you reproduce this issue with the current release?
  Yes
• Can you reproduce this issue with the beta channel?
  Yes
• Can you reproduce this issue with the dev channel?
  Yes
• Can you reproduce this issue with the nightly channel?
  Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
  N/A
• Does the issue resolve itself when disabling Brave Rewards?
  N/A
• Is the issue reproducible on the latest version of Chrome?
  No. Chrome has Google branding

Miscellaneous Information:

[btlechowski]

Reproduced on

Brave	0.63.55 Chromium: 74.0.3729.131 (Official Build) (64-bit)
Revision	518a41c1fa7ce1c8bb5e22346e82e42b4d76a96f-refs/branch-heads/3729@{#954}
OS	Windows 10 OS Build 17134.523