Change superclass to InstrumentedFragment.

- for fragments that do not implement the preference screen, change them
to inherit from InstrumentedFragment instead.

Change-Id: I791c2634024bd2c248efea955be5c680180d735c
Fixes: 68277111
Test: make RunSettingsRoboTests

src/com/android/settings/password/ConfirmLockPattern.java

@@ -104,11 +104,6 @@ public class ConfirmLockPattern extends ConfirmDeviceCredentialBaseActivity {
 
         }
 
-        @Override
-        public void onCreate(Bundle savedInstanceState) {
-            super.onCreate(savedInstanceState);
-        }
-
         @Override
         public View onCreateView(LayoutInflater inflater, ViewGroup container,
                 Bundle savedInstanceState) {