Revert "ART: add GC time ratio metrics to GC performance"

This reverts commit fe21070898e13cb5e6111d8749a97a679994eb5d.

Reason for revert: Segfaults when CC is not enabled.

Bug: 112187497
Change-Id: I9757097981a8120d893b0dbbd630ac4a87090a1d
Test: TreeHugger
6 files changed