Replace -webkit-transform with transform in Chrome UI

ui/webui/resources/css/tree.css

Index: ui/webui/resources/css/tree.css
diff --git a/ui/webui/resources/css/tree.css b/ui/webui/resources/css/tree.css
index a47735a1f3f0308c20338418c088933c84407ec7..a86baba5b08d53090e1b3f5578ced6b68624a503 100644
--- a/ui/webui/resources/css/tree.css
+++ b/ui/webui/resources/css/tree.css
@@ -22,7 +22,7 @@ tree {
 }
 
 .expand-icon {
-  -webkit-transform: rotate(-90deg);
+  transform: rotate(-90deg);
   -webkit-transition: all 150ms;
   background: url(../images/tree_triangle.svg) no-repeat center center;
   background-size: 8px 5px;
@@ -36,11 +36,11 @@ tree {
 }
 
 html[dir=rtl] .expand-icon {
-  -webkit-transform: rotate(90deg);
+  transform: rotate(90deg);
 }
 
 .tree-item[expanded] > .tree-row > .expand-icon {
-  -webkit-transform: rotate(0);
+  transform: rotate(0);
   background-image: url(../images/tree_triangle.svg);
   opacity: .5;
 }