Remove popup indicator for dialog style preference items.

Bug: 3341160
Change-Id: I1d3da0dfd7216f6bdea0c38347f57ec524a1641b

core/res/res/layout/preference_dialog.xml

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2006 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.
--->
-
-<!-- Layout used by DialogPreference in a PreferenceActivity. -->
-<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:layout_gravity="center"
-    android:background="@drawable/btn_circle"
-    android:src="@drawable/ic_btn_round_more" />

core/res/res/values/styles.xml

@@ -888,7 +888,6 @@
     <style name="Preference.DialogPreference">
         <item name="android:positiveButtonText">@android:string/ok</item>
         <item name="android:negativeButtonText">@android:string/cancel</item>
-        <item name="android:widgetLayout">@android:layout/preference_dialog</item>
     </style>
     
     <style name="Preference.DialogPreference.YesNoPreference">
@@ -904,7 +903,6 @@
         <item name="android:ringtoneType">ringtone</item>
         <item name="android:showSilent">true</item>
         <item name="android:showDefault">true</item>
-        <item name="android:widgetLayout">@android:layout/preference_dialog</item>
     </style>
 
     <!-- No margins or background by default. Could be different for x-large screens -->