Remove isCurrentProcessAdminUser()

Removed CarUserManagerHelper.isCurrentProcessAdminUser() and replaced
it with UserManager.isAdminUser().

Some classes were also updated to use UserHandle.myUserId() instead
of CarUserManagerHelper.getCurrentProcessUserInfo().  This was done
mostly so that we can remove some CarUserManagerHelper dependencies
and make the tests easier to understand.

Bug: 137136907
Test: atest CarSettingsRoboTests
Test: atest CarUserManagerHelperTest

Change-Id: Icb763b2d08d657c7b6af8adb29f4a2e1ca1d1e56
18 files changed
tree: 63670f2abe8d662f560457015755d6e0418c07f2
  1. res/
  2. src/
  3. tests/
  4. Android.bp
  5. AndroidManifest.xml
  6. PREUPLOAD.cfg