Hygiene: Remove reference to non-existing 'mobile.styles.page' module

As far as I can tell, this has never done anything. Added in f1d35e50,
but the module itself was removed *earlier* in bd1ce410.

Change-Id: If6eab6a868f1b17d76b08b787e277444b6ce1ebe
Merge "Hygiene: Remove reference to non-existing 'mobile.styles.page' module"