Revert "Add SimultaneousCallingTracker"

Revert submission 25956237-simultaneous-calling-tracker

Reason for revert: Probable culprit for b/326212561. Will be verifying through ABTD for confirmation and before submitting the revert.

Reverted changes: /q/submissionid:25956237-simultaneous-calling-tracker

Change-Id: If95751c2e95afed5f551ec018cd65aca21d5524b
6 files changed