Remove vendor specific CSS prefixes.

chrome/browser/resources/bookmark_manager/css/bmm.css

 /*
 Copyright (c) 2010 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.
 */
 html, body {
   margin: 0;
   width: 100%;
   height: 100%;
   cursor: default;
@@ skipping 223 matching lines @@
 html[dir=rtl] .header > div,
 html[dir=rtl] .header form {
   float: right;
 }
 
 #drop-overlay {
   position: absolute;
   display: none;
   pointer-events: none;
   border: 1px solid hsl(214, 91%, 85%);;
-  -webkit-border-radius: 3px;
+  border-radius: 3px;
   -webkit-box-sizing: border-box;
   background-color: hsla(214, 91%, 85%, .5);
   overflow: hidden;
   z-index: -1;
 }
 
 #drop-overlay.line {
   border: 3px solid black;
   border-top-color: transparent;
   border-bottom-color: transparent;
   background-color: black;
   background-clip: padding-box;
   height: 8px;
-  -webkit-border-radius: 0;
+  border-radius: 0;
   z-index: 10;
 }
 
 .toolbar button {
   -webkit-appearance: none;
   background: transparent;
   border: 0;
   font: inherit;
   padding: 0;
   background: -webkit-canvas(drop-down-arrow) 100% 50% no-repeat;
   padding-right: 11px;
 }
 
 html[dir=rtl] .toolbar button {
   background-position: 0% 50%;
   padding-right: 0;
   padding-left: 11px;
 }