Removing all disambiguation code from core

Disambiguation related functions have been re-implemented in the
Disambiguator extension.

Bug: 35981
Change-Id: I4afa30bf2677c6541ef355013f8eaef46abfbe03
Dependency: I41637ea43a9e5000bcb8a782441ce36f1068881f
Merge "Removing all disambiguation code from core"