MD Settings: Make Protected Content toggle change label text on toggle

chrome/browser/resources/settings/privacy_page/privacy_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_vars_css.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../clear_browsing_data_dialog/clear_browsing_data_dialog.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../lifetime_browser_proxy.html">
@@ skipping 427 matching lines @@
           </site-data-details-subpage>
         </settings-subpage>
       </template>
 <if expr="chromeos or is_win">
       <template is="dom-if" route-path="/content/protectedContent" no-search>
         <settings-subpage page-title="$i18n{siteSettingsProtectedContent}">
           <div class="settings-box first two-line">
             $i18n{siteSettingsProtectedContentExplanation}
           </div>
           <div class="settings-box first">
+            <!-- TODO(dschuyler): change i18n to i18nStr. -->
             <settings-toggle-button class="start"
                 pref="{{prefs.settings.privacy.drm_enabled}}"
-                label="$i18n{siteSettingsProtectedContentEnable}">
+                label="[[getStringTernary_(
+                    prefs.settings.privacy.drm_enabled.value,
+                    '$i18n{siteSettingsProtectedContentEnable}',
+                    '$i18n{siteSettingsBlocked}')]]">
             </settings-toggle-button>
           </div>
 <if expr="chromeos">
           <category-setting-exceptions
               category="{{ContentSettingsTypes.PROTECTED_CONTENT}}">
           </category-setting-exceptions>
 </if>
         </settings-subpage>
       </template>
 </if>
     </settings-animated-pages>
   </template>
   <script src="privacy_page.js"></script>
 </dom-module>