Change assertions for TimeElapsedDelta in metrics_test.cc am: 5b8016bb2c

Original change: https://android-review.googlesource.com/c/platform/art/+/2751788

Change-Id: I2f1965864697d2bc95333f84ea76fa03be01f327
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>