[Cleanup] Files.app: Adds missing periods at the end of the descriptions.

chrome/browser/resources/file_manager/js/media/util.js

 // Copyright (c) 2012 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.
 
 /**
  * A controller class detects mouse inactivity and hides "tool" elements.
  *
  * @param {Element} container The main DOM container.
  * @param {number} opt_timeout Hide timeout in ms.
  * @param {function():boolean=} opt_toolsActive Function that returns |true|
@@ skipping 49 matching lines @@
  * @param {boolean} on True if show, false if hide.
  */
 MouseInactivityWatcher.prototype.showTools = function(on) {
   if (on)
     this.container_.setAttribute('tools', 'true');
   else
     this.container_.removeAttribute('tools');
 };
 
 /**
- * @param {Element} element DOM element
+ * @param {Element} element DOM element.
  * @return {boolean} True if the element is a tool. Tools should never be hidden
  *   while the mouse is over one of them.
  */
 MouseInactivityWatcher.prototype.isToolElement = function(element) {
   return element.classList.contains('tool');
 };
 
 /**
  * To be called when the user started activity. Shows the tools
  * and cancels the countdown.
@@ skipping 76 matching lines @@
 
 /**
  * Timeout handler.
  * @private
  */
 MouseInactivityWatcher.prototype.onTimeout_ = function() {
   this.timeoutID_ = null;
   if (!this.disabled_ && !this.toolsActive_())
     this.showTools(false);
 };