[webui] get rid of more html[os=] rules

chrome/browser/resources/sync_internals/sync_search.css

-/*
-Copyright (c) 2011 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.
-*/
+/* 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. */
 
 #sync-search-query {
   width: 20em;
 }
 
 #sync-search-status {
   color: #333;
   font-style: italic;
 }
 
 #sync-results-container {
   display: -webkit-box;
   /* Should be > #sync-page's min-height. */
   /* TODO(akalin): Find a less hacky way to do this. */
   height: 750px;
 }
 
 #sync-results-list {
+  -webkit-padding-start: 10px;
+  box-sizing: border-box;
   height: 100%;
+  /* min-width and max-width are used by the split pane. */
+  max-width: 50%;
+  min-width: 50px;
+  overflow: auto;
+  padding: 5px;
   width: 275px;
-  /* min-width and max-width are used by the split pane. */
-  min-width: 50px;
-  max-width: 50%;
-  overflow: auto;
-  box-sizing: border-box;
-  padding: 5px;
-  -webkit-padding-start: 10px;
 }
 
 #sync-results-splitter {
-  width: 5px;
   background-color: #ebeff9;
   cursor: col-resize;
-}
-
-/* Platform annotations are set in sync_node_browser.js. */
-/* TODO(akalin): Make the BMM also use this style. */
-html[os=win] #sync-results-splitter {
+  width: 5px;
+<if expr="is_win">
+  /* TODO(akalin): Make the BMM also use this style. */
   cursor: e-resize;
+</if>
 }
 
 #sync-result-details-container {
   height: 100%;
   overflow: auto;
   -webkit-box-flex: 1;
 
   /* TODO(akalin): Figure out why this is needed, even with box-flex: 1. */
   width: 100%;
 }