[Android] Simplify "network predictions" preference to a boolean value.

chrome/android/java/res/values/arrays.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>
   <!-- These must be kept in sync (and in-order) with components/dom_distiller/core/font_family_list.h -->
   <string-array name="distiller_mode_font_family_values">
     <item>@string/sans_serif</item>
     <item>@string/serif</item>
     <item>@string/monospace</item>
   </string-array>
 
   <!-- Privacy preferences -->
-  <string-array name="bandwidth_entries">
-    <item>@string/always_prefetch_bandwidth_entry</item>
-    <item>@string/wifi_prefetch_bandwidth_entry</item>
-    <item>@string/never_prefetch_bandwidth_entry</item>
-  </string-array>
-  <string-array name="bandwidth_entry_values">
-    <item>@string/network_prediction_always_value</item>
-    <item>@string/network_prediction_wifi_only_value</item>
-    <item>@string/network_prediction_never_value</item>
-  </string-array>
   <string-array name="crash_upload_entries">
     <item>@string/crash_dump_always_upload</item>
     <item>@string/crash_dump_only_with_wifi</item>
     <item>@string/crash_dump_never_upload</item>
   </string-array>
   <string-array name="crash_upload_values">
     <item>@string/crash_dump_always_upload_value</item>
     <item>@string/crash_dump_only_with_wifi_value</item>
     <item>@string/crash_dump_never_upload_value</item>
   </string-array>
 
 </resources>