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

tests/robotests/src/com/android/settings/MainClearConfirmTest.java

@@ -77,6 +77,7 @@ public class MainClearConfirmTest {
 
         when(mMockActivity.getSystemService(Context.DEVICE_POLICY_SERVICE))
                 .thenReturn(mDevicePolicyManager);
+        when(mPersistentDataBlockManager.isFactoryResetProtectionActive()).thenReturn(false);
     }
 
     @Test
@@ -112,6 +113,13 @@ public class MainClearConfirmTest {
         assertThat(mMainClearConfirm.shouldWipePersistentDataBlock(null)).isFalse();
     }
 
+    @Test
+    public void shouldWipePersistentDataBlock_frpIsAlive_shouldReturnFalse() {
+        when(mPersistentDataBlockManager.isFactoryResetProtectionActive()).thenReturn(true);
+        assertThat(mMainClearConfirm.shouldWipePersistentDataBlock(mPersistentDataBlockManager))
+                .isFalse();
+    }
+
     @Test
     public void shouldWipePersistentDataBlock_deviceIsStillBeingProvisioned_shouldReturnFalse() {
         doReturn(true).when(mMainClearConfirm).isDeviceStillBeingProvisioned();