OemLockService: remove canUserAllowOemUnlock()

No longer used by Settings as the logic was wrong.

Test: gts-tradefed run gts -m GtsOemLockServiceTestCases
Bug: 65124732
Change-Id: I44e5f697aabd2b5eefecf64060502b5c9ef5f911
(cherry picked from commit d37fe2d3e1)

core/java/android/service/oemlock/IOemLockService.aidl

@@ -28,7 +28,6 @@ interface IOemLockService {
     void setOemUnlockAllowedByUser(boolean allowed);
     boolean isOemUnlockAllowedByUser();
 
-    boolean canUserAllowOemUnlock();
     boolean isOemUnlockAllowed();
     boolean isDeviceOemUnlocked();
 }

core/java/android/service/oemlock/OemLockManager.java

@@ -117,24 +117,6 @@ public class OemLockManager {
         }
     }
 
-    /**
-     * Returns whether all parties other than the user allow OEM unlock meaning the user can
-     * directly control whether or not the device can be OEM unlocked.
-     *
-     * If this is true, {@link #isOemUnlockAllowedByUser} is the same as {@link #isOemUnlockAllowed}
-     *
-     * @return Whether the user can directly control whether the device can be OEM unlocked.
-     *
-     * @hide
-     */
-    public boolean canUserAllowOemUnlock() {
-        try {
-            return mService.canUserAllowOemUnlock();
-        } catch (RemoteException e) {
-            throw e.rethrowFromSystemServer();
-        }
-    }
-
     /**
      * @return Whether the bootloader is able to OEM unlock the device.
      *

services/core/java/com/android/server/oemlock/OemLockService.java

@@ -149,8 +149,12 @@ public class OemLockService extends SystemService {
 
             final long token = Binder.clearCallingIdentity();
             try {
-                if (!canUserAllowOemUnlock()) {
-                    throw new SecurityException("User cannot allow OEM unlock");
+                if (!isOemUnlockAllowedByAdmin()) {
+                    throw new SecurityException("Admin does not allow OEM unlock");
+                }
+
+                if (!mOemLock.isOemUnlockAllowedByCarrier()) {
+                    throw new SecurityException("Carrier does not allow OEM unlock");
                 }
 
                 mOemLock.setOemUnlockAllowedByDevice(allowedByUser);
@@ -171,18 +175,6 @@ public class OemLockService extends SystemService {
             }
         }
 
-        @Override
-        public boolean canUserAllowOemUnlock() {
-            enforceOemUnlockReadPermission();
-
-            final long token = Binder.clearCallingIdentity();
-            try {
-                return isOemUnlockAllowedByAdmin() && mOemLock.isOemUnlockAllowedByCarrier();
-            } finally {
-                Binder.restoreCallingIdentity(token);
-            }
-        }
-
         @Override
         public boolean isOemUnlockAllowed() {
             enforceOemUnlockReadPermission();