Reduce usage of webkit CSS prefixes in chrome/browser/resources

chrome/browser/resources/options/chromeos/display_options.css

Index: chrome/browser/resources/options/chromeos/display_options.css
diff --git a/chrome/browser/resources/options/chromeos/display_options.css b/chrome/browser/resources/options/chromeos/display_options.css
index 36b6332e43546c57494a8cd542f2d3df7121d8d7..55d045549b7a7ac75fd332ae3e5a96b5f59c91de 100644
--- a/chrome/browser/resources/options/chromeos/display_options.css
+++ b/chrome/browser/resources/options/chromeos/display_options.css
@@ -31,11 +31,11 @@
  * This is achieved by a square rotated by 45-deg, and it has border at the
  * upper-half, which were left/top before the rotation. */
 #display-configuration-arrow {
-  -webkit-transform: rotate(45deg);
   border-left: 1px solid lightgrey;
   border-top: 1px solid lightgrey;
   height: 20px;
   position: absolute;
+  transform: rotate(45deg);
   width: 20px;
   z-index: 1;
 }