Disable the "Protected Content" section in the ChromeOS content settings dialog.

chrome/browser/resources/options2/content_settings.html

 <div id="content-settings-page" class="page" hidden>
   <div class="close-button"></div>
   <h1 i18n-content="contentSettingsPage"></h1>
   <div class="content-area">
     <!-- Cookie filter tab contents -->
     <section>
       <h3 i18n-content="cookies_tab_label"></h3>
       <div>
         <div class="radio">
           <label>
@@ skipping 237 matching lines @@
     <section>
       <h3 i18n-content="webIntentsTabLabel" class="content-settings-header">
       </h3>
       <div class="checkbox">
         <label>
           <input pref="webintents.enabled" type="checkbox">
           <span i18n-content="allowWebIntents"></span>
         </label>
       </div>
     </section>
-<if expr="pp_ifdef('chromeos')">
+<!-- TODO(markusheintz): Renable the Protected Content section once the 3rd
+     party dependencies of the backend are ready. -->
+<if expr="pp_ifdef('chromeos') and False">
     <!-- Protected Content filter -->
     <section guest-visibility="disabled">
       <h3 i18n-content="protectedContentTabLabel"
           class="content-settings-header"></h3>
       <div>
         <div class="settings-row">
           <span i18n-content="protectedContentInfo"></span>
         </div>
         <div class="checkbox">
           <label>
             <input pref="settings.privacy.drm_enabled" type="checkbox">
             <span i18n-content="protectedContentEnable"></span>
           </label>
         </div>
       </div>
     </section>
 </if>
   </div>
   <div class="action-area">
     <div class="button-strip">
       <button id="content-settings-overlay-confirm" i18n-content="ok"></button>
     </div>
   </div>
 </div>