Revert "Introduce SpellCheckerSessionParams."

Revert "Use SpellCheckerSessionParams in CTS."

Revert submission 14191185-ky-tsm

Reason for revert: breaks build test_suites_x86_64 b/185855437
Reverted Changes:
I724aaad15:Introduce SpellCheckerSessionParams.
I510a4cfec:Use SpellCheckerSessionParams in CTS.

Change-Id: I4173bd5bee62f02a248de69df77420c39326b9f0