Bug 1803434 - Remove no more used app update code. r=aleca

Differential Revision: https://phabricator.services.mozilla.com/D163516

--HG--
extra : amend_source : ebb75a27ada3371bd31a948e6c07c216377ef1ff

mail/base/content/messenger.xhtml

@@ -450,14 +450,6 @@
     </popupnotificationcontent>
   </popupnotification>
 
-#ifdef MOZ_UPDATER
-  <popupnotification id="app-update-notification" hasicon="true" hidden="true">
-    <popupnotificationcontent class="app-update-notification-content" orient="vertical">
-      <description id="app-update-text" class="app-update-text"/>
-    </popupnotificationcontent>
-  </popupnotification>
-#endif
-
 #include editContactPanel.inc.xhtml
 #include ../../components/im/content/chat-menu.inc.xhtml
 </popupset>

mail/themes/shared/mail/messenger.css

@@ -687,20 +687,6 @@ img.invisible-on-broken:-moz-broken {
   list-style-image: url(chrome://messenger/skin/icons/addon-install-installed.svg);
 }
 
-.app-update-icon {
-  background-color: #74BF43;
-  border-radius: 50%;
-}
-
-.popup-notification-icon[popupid="app-update"] {
-  background: #74BF43 url("chrome://messenger/skin/icons/app-update.svg") no-repeat center;
-  border-radius: 50%;
-}
-
-.popup-notification-icon[popupid="app-update"].updates-unsupported {
-  background-color: #FFE900;
-}
-
 .popup-notification-body[popupid="addon-progress"],
 .popup-notification-body[popupid="addon-install-confirmation"] {
   width: 28em;