Fix some JS style nits.

components/proximity_auth/webui/resources/log-buffer.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Polymer('log-buffer', {
   publish: {
     /**
      * List of displayed logs.
-     * @type {?Array.<{{
+     * @type {?Array<{{
      *    text: string,
      *    time: string,
      *    file: string,
      *    line: number,
      *    severity: number,
      * }}>} LogMessage
      */
     logs: null,
   },
 
@@ skipping 41 matching lines @@
 
   /**
    * Called when the log buffer is cleared.
    * @type {function()}
    */
   onLogBufferCleared: function() {},
 
   /**
    * Called in response to chrome.send('getLogMessages') with the log messages
    * currently in the buffer.
-   * @type {function(Array.<LogMessage>)}
+   * @type {function(Array<LogMessage>)}
    */
   onGotLogMessages: function(messages) {},
 };