Nitpicking fixes for Files.app code.

ui/file_manager/gallery/js/mosaic_mode.js

 // Copyright 2014 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.
 
 'use strict';
 
 /**
  * @param {Element} container Content container.
  * @param {cr.ui.ArrayDataModel} dataModel Data model.
  * @param {cr.ui.ListSelectionModel} selectionModel Selection model.
@@ skipping 448 matching lines @@
  * @param {Event} event Event.
  * @private
  */
 Mosaic.prototype.onSplice_ = function(event) {
   var index = event.index;
   this.layoutModel_.invalidateFromTile_(index);
 
   if (event.removed.length) {
     for (var t = 0; t !== event.removed.length; t++) {
       // If the layout for the tile has not done yet, the parent is null.
-      // And the layout will not be done after onSplice_ becuase it is removed
+      // And the layout will not be done after onSplice_ because it is removed
       // from this.tiles_.
       if (this.tiles_[index + t].parentNode)
         this.removeChild(this.tiles_[index + t]);
     }
 
     this.tiles_.splice(index, event.removed.length);
     this.scheduleLayout(Mosaic.LAYOUT_DELAY);
   }
 
   if (event.added.length) {
@@ skipping 1546 matching lines @@
   return new Rect(this.left_ - this.container_.scrollLeft, this.top_,
       this.width_, this.height_).inflate(-margin, -margin);
 };
 
 /**
  * @return {number} X coordinate of the tile center.
  */
 Mosaic.Tile.prototype.getCenterX = function() {
   return this.left_ + Math.round(this.width_ / 2);
 };