Revert "Frameworks/base: Refactor UserHandle and Environment a bit"

Breaks monkey in root mode.

This reverts commit 6e16714c688ed9c52763696f5a5e7b90802a471b.

Bug: 29338430
Change-Id: I238f89dad77d7dcae6d02eccbda52eb9c6c6466c
4 files changed