Issue 2477 - Add Adblocking settings on tablets

mobile/android/base/resources/xml-v11/preference_headers.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <!-- Tablet only: Sync is nested within the "Customize" header on tablets,
      instead of being a top-level menu item.
      See xml-v11/preferences.xml for single-pane v11+ phone layout. -->
 
 <preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
@@ skipping 10 matching lines @@
                android:value="preferences_display"/>
     </header>
 
     <header android:fragment="org.mozilla.gecko.preferences.GeckoPreferenceFragment"
             android:title="@string/pref_header_privacy_short">
         <extra android:name="resource"
                android:value="preferences_privacy"/>
     </header>
 
     <header android:fragment="org.mozilla.gecko.preferences.GeckoPreferenceFragment"
+            android:title="@string/abb_pref_header_adblocking">
+      <extra android:name="resource"
+             android:value="preferences_abb_abp"/>
+    </header>
+
+    <header android:fragment="org.mozilla.gecko.preferences.GeckoPreferenceFragment"
             android:title="@string/pref_header_language"
             android:id="@+id/pref_header_language">
         <extra android:name="resource"
                android:value="preferences_locale" />
     </header>
 
     <header android:fragment="org.mozilla.gecko.preferences.GeckoPreferenceFragment"
             android:title="@string/pref_header_vendor">
         <extra android:name="resource"
                android:value="preferences_vendor"/>
     </header>
 
     <!-- Removed devtools as part of https://issues.adblockplus.org/ticket/2475 -->
 
 </preference-headers>