MD Settings: Add description for Protected Content

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

Index: chrome/browser/resources/settings/privacy_page/privacy_page.html
diff --git a/chrome/browser/resources/settings/privacy_page/privacy_page.html b/chrome/browser/resources/settings/privacy_page/privacy_page.html
index 3bb8aeee8b9260893538907b88be04ec25ea5ff5..877b466647831aed89036d65bedd566656a266ae 100644
--- a/chrome/browser/resources/settings/privacy_page/privacy_page.html
+++ b/chrome/browser/resources/settings/privacy_page/privacy_page.html
@@ -441,6 +441,9 @@
 <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">
             <settings-toggle-button class="start"
                 pref="{{prefs.settings.privacy.drm_enabled}}"