Fix crash if trying to erase the FRP data.

- Once factory reset protection is on, user data shall not be erased.

Flag: EXEMPT bug fix
Fix: 345587437
Test: Manual test passed
Test: atest passed
Change-Id: I9506224cae7ba12c4181f2b2c676e5eb8ec27431

src/com/android/settings/MainClearConfirm.java

@@ -89,8 +89,7 @@ public class MainClearConfirm extends InstrumentedFragment {
             final PersistentDataBlockManager pdbManager;
             // pre-flight check hardware support PersistentDataBlockManager
             if (!SystemProperties.get(PERSISTENT_DATA_BLOCK_PROP).equals("")) {
-                pdbManager = (PersistentDataBlockManager)
-                    getActivity().getSystemService(Context.PERSISTENT_DATA_BLOCK_SERVICE);
+                pdbManager = getActivity().getSystemService(PersistentDataBlockManager.class);
             } else {
                 pdbManager = null;
             }
@@ -152,6 +151,11 @@ public class MainClearConfirm extends InstrumentedFragment {
             return false;
         }
 
+        // Do not try to erase factory reset protection data if the protection is alive.
+        if (pdbManager.isFactoryResetProtectionActive()) {
+            return false;
+        }
+
         // The persistent data block will persist if the device is still being provisioned.
         if (isDeviceStillBeingProvisioned()) {
             return false;