Keep internal/aosp code in sync

SystemClock.elapsedRealtimeClock() could not be used in aosp/master
when the code was cherry-picked outside.

The method is also marked as @Removed. This change makes the
goog/master code the same as aosp/master code to avoid conflicts in
future.

Bug: 78217059
Test: build
Change-Id: Iaa68baf71f9339705b0a7db00cbcdc6da512b79b