[WebUI] Fix rest of CSS style nits in misc. dirs so I can turn on CSS checker.

chrome/browser/resources/test_presubmit.py

 #!/usr/bin/env python
 # 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.
 
 """Unit tests for Web Development Style Guide checker."""
 
 import os
 import re
 import sys
@@ skipping 424 matching lines @@
   -webkit-animation: anim 0s;
   -webkit-animation-duration: anim 0ms;
   -webkit-transform: scale(0%),
                      translateX(0deg),
                      translateY(0rad),
                      translateZ(0grad);
   background-position-x: 0em;
   background-position-y: 0ex;
   border-width: 0em;
   color: hsl(0, 0%, 85%); /* Shouldn't trigger error. */
+  opacity: .0;
+  opacity: 0.0;
+  opacity: 0.;
 }
 
 @page {
   border-width: 0mm;
   height: 0cm;
   width: 0in;
 }""", """
 - Make all zero length terms (i.e. 0px) 0 unless inside of hsl() or part of"""
 """ @keyframe.
     width: 0px;
     -webkit-animation: anim 0s;
     -webkit-animation-duration: anim 0ms;
     -webkit-transform: scale(0%),
     translateX(0deg),
     translateY(0rad),
     translateZ(0grad);
     background-position-x: 0em;
     background-position-y: 0ex;
     border-width: 0em;
+    opacity: .0;
+    opacity: 0.0;
+    opacity: 0.;
     border-width: 0mm;
     height: 0cm;
     width: 0in;
 """)
 
 if __name__ == '__main__':
   unittest.main()