PDFs are missing print and download buttons

[LaurenWags]

Description

PDFs no longer display the print and download buttons. This broke between 1.75.67 and 1.75.68, maybe due to brave/brave-core#26676.

Found by @emerick 😄

Steps to reproduce

1. Using version 1.75.68 or higher, navigate to a PDF such as https://file-examples.com/storage/feb3ceaed86762e98a0a444/2017/10/file-sample_150kB.pdf
2. Look for print and download buttons (should be next to the 3 dots menu)
3. They are not visible, but if you hover over where they should be the areas highlight

Actual result

Example	Example

Expected result

Reproduces how often

Easily reproduced

Brave version (brave://version info)

Nightly 1.75.68 Chromium: 132.0.6834.15 and higher.

Does not reproduce in Beta, 1.74.29 Chromium: 132.0.6834.46

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

cc @rebron @fallaciousreasoning @brave/qa-team