Add a disabled property to DOMUI lists

chrome/browser/resources/shared/css/list.css

 
 list {
   display: block;
   outline: none;
   overflow: auto;
   position: relative; /* Make sure that item offsets are relative to the
                          list. */
   height: 200px;
 }
 
@@ skipping 19 matching lines @@
 
 list:focus > [lead] {
   border-color: hsl(214, 91%, 65%);
   z-index: 2;
 }
 
 list > [anchor] {
 
 }
 
-list > :hover {
+list:not([disabled]) > :hover {
   border-color: hsl(214, 91%, 85%);
   z-index: 1;
   background-color: hsl(214, 91%, 97%);
 }
 
 list > [selected] {
   background-image: -webkit-gradient(linear, left top, left bottom,
       from(rgba(255,255,255,0.8)), to(rgba(255,255,255,0)));
 }
 
@@ skipping 14 matching lines @@
   border-color: hsl(214, 91%, 65%);
 }
 
 list > .spacer {
   border: 0;
   -webkit-box-sizing: border-box;
   overflow: hidden;
   visibility: hidden;
   margin: 0;
 }