[WebUI] Fix rest of CSS style nits in misc. dirs so I can turn on CSS checker.

chrome/browser/resources/downloads/downloads.css

 /* 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.
- */
+ * found in the LICENSE file. */
 
 #downloads-summary {
   background-color: rgb(235, 239, 249);
   border-top: 1px solid rgb(156, 194, 239);
   margin-bottom: 6px;
   margin-top: 12px;
   padding: 3px;
 }
 
 #downloads-summary-text {
@@ skipping 57 matching lines @@
 
 html[dir=rtl] .icon {
   left: auto;
   right: 9px;
 }
 
 .download.otr > .safe,
 .download.otr > .show-dangerous {
   -webkit-transition: opacity 150ms;
   background: url('../shared/images/otr_icon_standalone.png')
-              no-repeat 100% 100%;
+              no-repeat right bottom;
   opacity: .66;
 }
 
 html[dir=rtl] .download.otr > .safe,
 html[dir=rtl] .download.otr > .show-dangerous {
-  background-position: 0% 100%;
+  background-position: left bottom;
 }
 
 .download.otr > .safe:hover,
 .download.otr > .show-dangerous:hover {
   opacity: 1;
 }
 
 .progress {
   height: 48px;
   left: 0;
@@ skipping 45 matching lines @@
 
 .controls a {
   -webkit-margin-end: 16px;
   color: #777;
 }
 
 #downloads-pagination {
   -webkit-margin-start: 18px;
   padding-top: 24px;
 }