Missing option to allow access to file URLs in PDFJS

[Brave-Matt]

Description

In Brave Beta/Dev, the PDFJS config options are incomplete. In the "Details" section of the extension, the option to "Allow access to file URLs" option is missing. Setting this allows the browser to find/display pdf files stored locally in-browser.

When testing this on Chrome, navigating to the details section shows this option here:

Without this option available, all locally stored pdf files display in browser like so:

Steps to Reproduce

N/A

Actual result:

N/A

Expected result:

N/A

Reproduces how often:

Always

Brave version (chrome://version info)

Version 0.55.10 Chromium: 70.0.3538.22 (Official Build) beta (64-bit)

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds? Yes
• Does it reproduce on browser-laptop? Yes

Website problems only:

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

Additional Information

One (of many) user report of this behavior:
https://www.reddit.com/r/brave_browser/comments/9jghrb/brave_beta_now_available/e6zelyo/?context=3&utm_content=context&utm_medium=message&utm_source=reddit&utm_name=frontpage

[LaurenWags]

Verified passed with:

Brave	0.55.13 Chromium: 70.0.3538.54 (Official Build) beta(64-bit)
Revision	4f8e578b6680574714e9ed3bb9f02922b4dde40d-refs/branch-heads/3538@{#937}
OS	Mac OS X

• Verified per Use component updater for installing PDF.js brave-core#596 that PDF.js does not display in chrome://extensions but only displays in chrome://components

Verification passed on

Brave	0.55.13 Chromium: 70.0.3538.54 (Official Build) beta(64-bit)
Revision	4f8e578b6680574714e9ed3bb9f02922b4dde40d-refs/branch-heads/3538@{#937}
OS	Linux

• Verified PDF is listed as a component in chrome://components and updated

Verification passed on

Brave	0.55.13 Chromium: 70.0.3538.54 (Official Build) beta (64-bit)
Revision	4f8e578b6680574714e9ed3bb9f02922b4dde40d-refs/branch-heads/3538@{#937}
OS	Windows 7