Merge "Remove unused fields from ProcessObserver." into main am: 89258c7d25

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2891794

Change-Id: I1fed2653faff6662e403e205712db6afd1dd0ef9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>