Refactor functions into EmergencyNumberTracker

Test: Treehugger
Bug: 112657134
Change-Id: Ibb5187d245ba9518cf517a64eee26f4169d4bf38
Merged-In: Ibb5187d245ba9518cf517a64eee26f4169d4bf38
(cherry picked from commit 854d44b199e4815aa12e95e8bb910505de902385)
1 file changed