Messaging: Remove compatibility for old android versions

Change-Id: Id9065d60525a509271a0e64c0e349e857cb998e2

res/drawable/widget_item_background.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2015 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.
+-->
+
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@color/ripple_material_light" >
+    <item android:id="@android:id/mask">
+        <color android:color="@android:color/white" />
+    </item>
+</ripple>