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

chrome/browser/resources/file_manager/js/photo/slide_mode.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.
 
 /**
  * Slide mode displays a single image and has a set of controls to navigate
  * between the images and to edit an image.
  *
  * TODO(kaznacheev): Introduce a parameter object.
  *
@@ skipping 50 matching lines @@
  */
 SlideMode.editorModes = [
   new ImageEditor.Mode.InstantAutofix(),
   new ImageEditor.Mode.Crop(),
   new ImageEditor.Mode.Exposure(),
   new ImageEditor.Mode.OneClick('rotate_left', new Command.Rotate(-1)),
   new ImageEditor.Mode.OneClick('rotate_right', new Command.Rotate(1))
 ];
 
 /**
- * @return {string} Mode name
+ * @return {string} Mode name.
  */
 SlideMode.prototype.getName = function() { return 'slide' };
 
 /**
  * Initialize the listeners.
  * @private
  */
 SlideMode.prototype.initListeners_ = function() {
   window.addEventListener('resize', this.onResize_.bind(this), false);
 };
@@ skipping 279 matching lines @@
  * @return {Rect} Screen rectangle of the selected image.
  */
 SlideMode.prototype.getSelectedImageRect = function() {
   if (this.getSelectedIndex() < 0)
     return null;
   else
     return this.viewport_.getScreenClipped();
 };
 
 /**
- * @return {Gallery.Item} Selected item
+ * @return {Gallery.Item} Selected item.
  */
 SlideMode.prototype.getSelectedItem = function() {
   return this.getItem(this.getSelectedIndex());
 };
 
 /**
  * Selection change handler.
  *
  * Commits the current image and displays the newly selected image.
  * @private
@@ skipping 881 matching lines @@
       done = true;
     }
   }.bind(this);
 };
 
 /**
  * If the user touched the image and moved the finger more than SWIPE_THRESHOLD
  * horizontally it's considered as a swipe gesture (change the current image).
  */
 SwipeOverlay.SWIPE_THRESHOLD = 100;