Use "protected" instead of "premium" for media content.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 10403 matching lines @@
       <message name="IDS_MEDIASTREAM_SETTING_CHANGED_MESSAGE" desc="Message that is used to suggest reloading when media (camera, microphone) settings was changed by the user. These settings are immediately effective, but the web page might not know how to deal with the new settings.">
         This page may need to be reloaded before the new settings take effect.
       </message>
 
       <!-- Protected media identifier permission infobar -->
       <if expr="is_android or chromeos">
         <message name="IDS_PROTECTED_MEDIA_IDENTIFIER_PERMISSION_FRAGMENT" desc="Permission fragment shown in the permissions bubble when a web page requests access to the computer's protected media identifier.">
           Know your unique device identifier
         </message>
         <message name="IDS_PROTECTED_MEDIA_IDENTIFIER_INFOBAR_QUESTION" desc="Question asked on the infobar whenever URL wants to access protected media identifier. It shows the origin of the URL.">
-          <ph name="URL">$1<ex>https://www.youtube.com</ex></ph> wants to uniquely identify your device to play premium content.
+          <ph name="URL">$1<ex>https://www.youtube.com</ex></ph> wants to uniquely identify your device to play protected content.
         </message>
       </if>
 
       <message name="IDS_MANAGE_PASSWORDS_CONFIRM_GENERATED_TITLE" desc="The title text that is used in the manage passwords bubble when the user has generated a password.">
         Password saved
       </message>
       <message name="IDS_MANAGE_PASSWORDS_CONFIRM_GENERATED_TEXT" desc="A message that the browser shows after saving a password it has autogenerated for the user. This message appears in a bubble and contains a link to all the user's saved autogenerated passwords. The link text is a separate string in the translation console and appears here as placeholder text.">
         Access your passwords from any device at <ph name="SAVED_PASSWORDS_LINK">$1<ex>passwords.google.com</ex></ph>
       </message>
       <if expr="is_android">
@@ skipping 1926 matching lines @@
       Your downloads appear here
     </message>
 
     <!-- Automation info bar -->
     <message name="IDS_CONTROLLED_BY_AUTOMATION" desc="Message shown when the browser session is being controlled by an automated test.">
       Chrome is being controlled by automated test software.
     </message>
   </messages>
  </release>
 </grit>