Strip referer to strict-origin-when-cross-origin in all cases #13464
Description
This is a follow up to #13434 (which is no longer needed)
Brave currently completely strips the referrer on all cross origin top-frame navigations. This causes Brave to look like bots / fraud for some non-malicious systems (e.g., DDG and similar).
We should change Brave's referrer policy to cap at (i.e. send less when the page requests less, but cap and default to strict-origin-when-cross-origin)