Move ButtonCompat to ui/android/

chrome/android/java/res/values-v21/styles.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <resources>
     <!-- Preferences -->
     <style name="PreferencesTheme" parent="ThemeWithActionBar">
         <item name="android:textColorLink">@color/pref_accent_color</item>
         <item name="android:alertDialogTheme">@style/PreferencesDialogTheme</item>
@@ skipping 27 matching lines @@
     <style name="PreferenceLayoutBase">
         <item name="android:background">?android:attr/activatedBackgroundIndicator</item>
         <item name="android:minHeight">?android:attr/listPreferredItemHeightSmall</item>
         <item name="android:paddingTop">16dp</item>
         <item name="android:paddingBottom">16dp</item>
         <item name="android:paddingStart">?android:attr/listPreferredItemPaddingStart</item>
         <item name="android:paddingEnd">?android:attr/listPreferredItemPaddingEnd</item>
     </style>
     <style name="PreferenceLayout" parent="PreferenceLayoutBase" />
 
-    <!-- Buttons -->
-    <style name="ButtonCompat" parent="ButtonCompatBase">
-        <item name="android:background">@drawable/button_compat</item>
-        <item name="android:fontFamily">sans-serif-medium</item>
-    </style>
-    <style name="ButtonCompatBorderless" parent="ButtonCompat">
-        <item name="android:background">@drawable/button_borderless_compat</item>
-    </style>
     <!-- Cast and media playback notifications -->
     <style name="MediaNotificationTitle"
         parent="@android:style/TextAppearance.Material.Notification.Title">
     </style>
     <style name="MediaNotificationText"
         parent="@android:style/TextAppearance.Material.Notification"/>
     <style name="RemoteNotificationTitle"
         parent="@android:style/TextAppearance.Material.Notification.Title">
         <item name="android:layout_marginBottom">4dp</item>
     </style>
     <style name="RemoteNotificationText"
         parent="@android:style/TextAppearance.Material.Notification.Line2"/>
     <style name="RemoteNotificationProgressBar" parent="@android:style/Widget.ProgressBar.Horizontal">
         <item name="android:minHeight">5dp</item>
     </style>
 
     <style name="IncognitoTheme" parent="MainTheme">
         <item name="android:colorPrimary">@color/incognito_primary_color</item>
     </style>
 
 </resources>