Remove summary provider

- use SummaryProvider to provide the summary of UserSettings
- use WifiDisplayPreferenceController to replace the summary loader
in WifiDisplaySettings
- use ConfigureNotificationPreferernceController to replace the
sumary load in ConfigureNotificationSettings

Fixes: 141653158
Test: robolectric
Change-Id: Id5f5ed645707caa0b25ecae5252174cbf017651c

tests/robotests/src/com/android/settings/testutils/shadow/ShadowNotificationBackend.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.testutils.shadow;
+
+import com.android.settings.notification.NotificationBackend;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+
+@Implements(NotificationBackend.class)
+public class ShadowNotificationBackend {
+
+    private static int sBlockAppCount;
+
+    @Implementation
+    protected int getBlockedAppCount() {
+        return sBlockAppCount;
+    }
+
+    public static void setBlockedAppCount(int blockAppCount) {
+        sBlockAppCount = blockAppCount;
+    }
+}