Revert^3 "Use nanoseconds for v2 method tracing"

This reverts commit 84c60905008131ff35b93b9f8b64923e267f92a6.

Reason for revert: Reverting because of failures on qemu.arm64.
https://ci.chromium.org/ui/p/art/builders/ci/qemu.arm.64/202/overview

Change-Id: I96eeb4b675eb36850f64e4f3102e55f456747762
6 files changed