OOBE: Explicitly ignore some messages from Gaia for cleaner logs

Bug: none
Change-Id: Ifd08d0ccc25463a0502f935b5c1c13eb8a1120bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1924521
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717575}

chrome/browser/resources/gaia_auth_host/authenticator.js

@@ -202,6 +202,16 @@ cr.define('cr.login', function() {
     }
   };
 
+  /**
+   * Old or not supported on Chrome OS messages.
+   * @type {!Array<string>}
+   * @const
+   */
+  const IGNORED_MESSAGES_FROM_GAIA = [
+    'clearOldAttempts',
+    'showConfirmCancel',
+  ];
+
   /**
    * Initializes the authenticator component.
    */
@@ -765,7 +775,7 @@ cr.define('cr.login', function() {
       const msg = e.data;
       if (msg.method in messageHandlers) {
         messageHandlers[msg.method].call(this, msg);
-      } else {
+      } else if (!IGNORED_MESSAGES_FROM_GAIA.includes(msg.method)) {
         console.warn('Unrecognized message from GAIA: ' + msg.method);
       }
     }