Fixed typos Files.app's CSS.

chrome/browser/resources/file_manager/css/common.css

 /* 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. */
 
 /* This file contains "borrowed" copy of standard styles. To simplify merging,
  * when altering, please preserve original property value by adding comments. */
 input.common[type='checkbox'],
 input.common[type='radio'] {
   -webkit-appearance: none;
   border: 1px solid #555;
@@ skipping 125 matching lines @@
 }
 
 body:not([new-ui]) .buttonbar button.small {
   min-width: 34px;
   padding: 0;
   width: 34px;
 }
 
 body:not([new-ui]) .buttonbar button {
   -webkit-margin-after: 0;
-  -webkit-margin-begin: 0;
+  -webkit-margin-before: 0;
   -webkit-margin-end: 0;
   -webkit-margin-start: 8px;
   -webkit-user-select: none;
   background-color: whiteSmoke;
   background-image: linear-gradient(to bottom, whiteSmoke, #F1F1F1);
   border: 1px solid rgba(0, 0, 0, 0.1);
   border-radius: 2px;
   box-shadow: none;
   box-sizing: content-box;
   color: #444;
@@ skipping 67 matching lines @@
 body:not([new-ui]) .buttonbar button.action,
 body:not([new-ui]) .buttonbar button.action:focus,
 body:not([new-ui]) .buttonbar button.action:hover,
 body:not([new-ui]) .buttonbar button.action:active {
   background-color: rgb(209, 72, 54);
   background-image: -webkit-gradient(linear,
       left top, left bottom, from(rgb(221, 75, 57)), to(rgb(209, 72, 54)));
   border: 1px solid transparent;
   color: #FFF;
   font-weight: bold;
-  letter-spacing: 1;
+  letter-spacing: 1px;
   text-transform: uppercase;
 }
 
 body:not([new-ui]) .buttonbar button.action:not([disabled]):focus {
   border-color: rgb(209, 72, 54);
 }
 
 body:not([new-ui]) .buttonbar button.action:not([disabled]):hover {
   background-color: rgb(197, 55, 39);
   background-image: -webkit-gradient(linear,
@@ skipping 456 matching lines @@
   width: 44px;
 }
 
 body[new-ui] .cr-dialog-close:hover {
   background-image: url('chrome://theme/IDR_CLOSE_DIALOG_H');
 }
 
 body[new-ui] .cr-dialog-close:active {
   background-image: url('chrome://theme/IDR_CLOSE_DIALOG_P');
 }