Having the print preview open in one tab blocks all requests on other tabs

[MRVDH]

Description

Having the print preview open in one tab blocks all requests on other tabs

Steps to Reproduce

• open the print preview in tab 1
• try to navigate to any page on tab 2

Actual result:

"Waiting for extension PDF Viewer..."

Expected result:

Non-blocking requests

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	0.66.101 Chromium: 75.0.3770.142 (Official Build) (64-bit)
Revision	8d93477bd18154c67a70a67019cb8032382c55dd-refs/branch-heads/3770@{#1160}
OS	Windows 10 OS Version 1803 (Build 17134.885)

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
  No
• Does the issue resolve itself when disabling Brave Rewards?
  No
• Is the issue reproducible on the latest version of Chrome?
  No

Miscellaneous Information:

[rebron]

Closing. Should be fixed with 68.x, pdf changes.

[LaurenWags]

Verified passed with

Brave	0.68.130 Chromium: 76.0.3809.100 (Official Build) (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Mac OS X

• reproduced issue using STR above on 0.67.125. Could not reproduce issue on 0.68.130.

Verification passed on

Brave	0.68.130 Chromium: 76.0.3809.100 (Official Build) (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Windows 10 OS Version 1803 (Build 17134.523)

• The issue is reproducible in 0.67.125
• Could not reproduce the issue in 0.68.130

Verification passed on

Brave	0.68.130 Chromium: 76.0.3809.100 (Official Build) (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Ubuntu 18.04 LTS

• reproduced issue using STR above on 0.67.125. Could not reproduce issue on 0.68.130.