Revert "Update style names due to theme migration"

This reverts commit cc16feb726.

Reason for revert: in b/70031670 we discovered some problems in
the support library side change (ag/3136307), and it will take a
little while to fix those problems so we need to temporarily
revert the support library changes to unblock a push of the
support library to google3.

Change-Id: I2086f434d5bcb518e474734b6d2b98a4b1c194d2

res/layout/preference_dropdown_material_settings.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2016 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.
+  -->
+
+
+<!-- Based off frameworks/base/core/res/res/layout/preference_dropdown_material.xml
+     except that icon space in this layout is always reserved -->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <Spinner
+        android:id="@+id/spinner"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="@dimen/preference_no_icon_padding_start"
+        android:visibility="invisible" />
+
+    <include layout="@layout/preference_material"/>
+
+</FrameLayout>

res/values/styles_preference.xml

@@ -20,19 +20,19 @@
 <resources>
 
     <!-- Fragment style -->
-    <style name="SettingsPreferenceFragmentStyle" parent="@style/PreferenceFragment.Material">
+    <style name="SettingsPreferenceFragmentStyle" parent="@style/PreferenceFragmentStyle.SettingsBase">
         <item name="android:layout">@layout/preference_list_fragment</item>
     </style>
 
-    <style name="ApnPreference" parent="@style/Preference.Material">
+    <style name="ApnPreference" parent="Preference.SettingsBase">
         <item name="android:layout">@layout/apn_preference_layout</item>
     </style>
 
-    <style name="SettingsSeekBarPreference" parent="@style/Preference.Material">
+    <style name="SettingsSeekBarPreference" parent="Preference.SettingsBase">
         <item name="android:layout">@layout/preference_widget_seekbar_settings</item>
     </style>
 
-    <style name="SyncSwitchPreference" parent="@style/Preference.Material">
+    <style name="SyncSwitchPreference" parent="Preference.SettingsBase">
         <item name="android:widgetLayout">@layout/preference_widget_sync_toggle</item>
     </style>