OnDrive PowerPoint presentations broken by anti-fingerprinting

[fmarier]

Description

OneDrive presentations are broken when Shields' anti-fingerprinting mode is enabled.

Steps to Reproduce

1. Visit https://onedrive.live.com/view.aspx?resid=40AD2A59FD334E8C!400130&ithint=file%2cpptx&authkey=!ADAerq8JH6E4yRA
2. Go into Shields and switch the anti-fingerprinting setting to: "All device recognition allowed".

Actual result:

With "3rd party device recognition blocked":

With "all device recognition allowed":

Expected result:

The slides should load properly.

Reproduces how often:

Always reproducible.

Brave version (brave://version info)

Brave | 0.62.51 Chromium: 73.0.3683.103 (Official Build) (64-bit)
Revision | e82a658d8159cabbd4938c1660f9bb00b4a82a23-refs/branch-heads/3683@{#902}
OS | Linux

Reproducible on current release:

It's also broken on brave-browser dev/beta builds.

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?

Yes, though only the anti-fingerprinting setting needs to be disabled.

• Is the issue reproducible on the latest version of Chrome?

No.