[Android] Update Protected Media Identifier Settings UI to reflect exceptions.

chrome/android/java/res/xml/content_preferences.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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. -->
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
     <!-- All sites -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="website_settings"
@@ skipping 26 matching lines @@
     <!-- Popups -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="popups" />
     <!-- Fullscreen -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="fullscreen" />
     <!-- Protected content -->
     <Preference
-        android:fragment="org.chromium.chrome.browser.preferences.ProtectedContentPreferences"
+        android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="protected_content" />
     <!-- Google Translate -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.TranslatePreferences"
         android:key="translate"
         android:title="@string/google_translate"
         android:icon="@drawable/settings_translate" />
     <!-- Storage -->
     <!-- TODO(finnur): Move this over to the new Usage screen, once it exists. -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="use_storage"
         android:title="@string/website_settings_storage"
         android:icon="@drawable/settings_storage" />
 </PreferenceScreen>