Merge "Remove unused fields from ProcessObserver." into main am: 89258c7d25 am: 26b51dca2d am: 4901f3ce52

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

Change-Id: I8e8d061236c6cd42433cabeeb31d6c9ffbe34a98
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>