b61cfbef7c
The general layout of the info pane is the same across platforms, so share the styles. This fixes the missing spacing on macOS after bug 1881256. Due to the changes in that bug, Windows no longer needs its own input styling, as it achieves the same appearance as the base styles (except for colors, which have been carried over). Applied nesting to modified files. Differential Revision: https://phabricator.services.mozilla.com/D215464
