Clean up automotive paths of code

[samartnik]

Description

This is a follow up for code review suggestion brave/brave-core#30537 (comment)

my main concern here is that these are untested code paths because no one anywhere is running them an automotive devices. Can we create a follow-up issue to look at these and decide what to do in general

Steps to reproduce

n/a

Actual result

n/a

Expected result

n/a

Reproduces how often

Easily reproduced

Brave version

n/a

Device

• Brand/model: n/a
• Android version: n/a

Channel information

• release (stable)
• beta
• nightly

Reproducibility

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

Miscellaneous information

No response