Remove CarUserManagerHelper #getCurrentForegroundUserInfo and #getCurrentForegroundUserId

Removes these two APIs in favor of using UserManager APIs and
ActivityManager.getCurrentUser().

Bug: 131776619
Test: atest CarServiceUnitTest
Test: atest CarServiceTest
Test: atest CarSettingsRoboTests

Change-Id: Ibd205259e699a5817203598b51e090d7abfe8463
diff --git a/service/src/com/android/car/ICarImpl.java b/service/src/com/android/car/ICarImpl.java
index 6e0b6fa..b3cbd16 100644
--- a/service/src/com/android/car/ICarImpl.java
+++ b/service/src/com/android/car/ICarImpl.java
@@ -146,8 +146,7 @@
                 mCarDrivingStateService, mCarPropertyService);
         mCarPackageManagerService = new CarPackageManagerService(serviceContext,
                 mCarUXRestrictionsService,
-                mSystemActivityMonitoringService,
-                mUserManagerHelper);
+                mSystemActivityMonitoringService);
         mPerUserCarServiceHelper = new PerUserCarServiceHelper(serviceContext);
         mCarBluetoothService = new CarBluetoothService(serviceContext, mPerUserCarServiceHelper);
         mCarInputService = new CarInputService(serviceContext, mHal.getInputHal());
@@ -164,8 +163,7 @@
                 serviceContext, mCarAudioService, this);
         mVmsBrokerService = new VmsBrokerService();
         mVmsClientManager = new VmsClientManager(
-                serviceContext, mVmsBrokerService, mCarUserService, mUserManagerHelper,
-                mHal.getVmsHal());
+                serviceContext, mVmsBrokerService, mCarUserService, mHal.getVmsHal());
         mVmsSubscriberService = new VmsSubscriberService(
                 serviceContext, mVmsBrokerService, mVmsClientManager, mHal.getVmsHal());
         mVmsPublisherService = new VmsPublisherService(
@@ -736,8 +734,7 @@
                     break;
                 case COMMAND_REMOVE_TRUSTED_DEVICES:
                     mCarTrustedDeviceService.getCarTrustAgentEnrollmentService()
-                            .removeAllTrustedDevices(
-                                    mUserManagerHelper.getCurrentForegroundUserId());
+                            .removeAllTrustedDevices(ActivityManager.getCurrentUser());
                     break;
                 case COMMAND_SET_UID_TO_ZONE:
                     if (args.length != 3) {