Use ButtonCompat to get Material-y buttons in more places.

chrome/android/java/res/values-v17/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.
--->
+     found in the LICENSE file. -->
 
 <resources>
     <!-- Preferences -->
     <style name="PreferencesTheme" parent="ThemeWithActionBar">
         <item name="android:textColorLink">@color/pref_accent_color</item>
-        <item name="android:buttonStyle">@style/PreferenceButtonStyle</item>
         <item name="android:textAppearanceMedium">@style/PreferenceTextAppearanceMedium</item>
         <item name="android:preferenceCategoryStyle">@style/PreferenceCategory</item>
         <item name="android:spinnerItemStyle">@style/PreferenceSpinnerItem</item>
         <item name="floatLabelTextAppearance">@style/PreferenceFloatLabelTextAppearance</item>
         <item name="floatLabelPaddingLeft">@dimen/pref_autofill_field_horizontal_padding</item>
         <item name="floatLabelPaddingRight">@dimen/pref_autofill_field_horizontal_padding</item>
         <item name="floatLabelPaddingTop">@dimen/pref_autofill_field_top_padding</item>
     </style>
-    <style name="PreferenceButtonStyle" parent="@android:style/Widget.Holo.Light.Button">
-        <!-- TODO(twellington): Delete btn_default_preferences.xml once the AppCompat theme supports
-                                Material-like buttons. -->
-        <item name="android:background">@drawable/btn_default_preferences</item>
-        <item name="android:textAllCaps">true</item>
-        <item name="android:textColor">#fff</item>
-        <item name="android:textSize">14sp</item>
-        <item name="android:textStyle">bold</item>
-    </style>
     <style name="PreferenceTextAppearanceMedium">
         <item name="android:textSize">18sp</item>
         <item name="android:textColor">?android:attr/textColorPrimary</item>
     </style>
     <style name="PreferenceCategory">
         <item name="android:layout">@layout/preference_category</item>
         <item name="android:shouldDisableView">false</item>
         <item name="android:selectable">false</item>
     </style>
     <style name="PreferenceCategoryWithButtonStyle">
@@ skipping 173 matching lines @@
         <item name="android:gravity">center_vertical|center_horizontal</item>
     </style>
     <style name="ButtonCompat" parent="ButtonCompatBase">
         <item name="android:background">@drawable/button_compat_shape</item>
     </style>
     <style name="ButtonBorderlessCompat" parent="ButtonCompat">
         <item name="android:background">?attr/selectableItemBackground</item>
     </style>
 
 </resources>