[WebUI] Fix 0-length unary term false positive in CSS presubmit.

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 427 matching lines @@
   0% { /* Ignore key frames */
     width: 0px;
   }
   10% {
     width: 10px;
   }
   100% {
     width: 100px;
   }
 }
-.animating {
+
+.media-button.play > .state0.active,
+.media-button[state='0'] > .state0.normal /* blah */, /* blee */
+.media-button[state='0']:not(.disabled):hover > .state0.hover {
   -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. */
@@ skipping 22 matching lines @@
     opacity: .0;
     opacity: 0.0;
     opacity: 0.;
     border-width: 0mm;
     height: 0cm;
     width: 0in;
 """)
 
 if __name__ == '__main__':
   unittest.main()