Cleanup: fix some CSS comment styles (especially copyrights)

chrome/browser/resources/history/history.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. */
 
 html[dir='rtl'] body.uber-frame > .page {
   -webkit-margin-end: 0;
 }
 
 body.uber-frame > .page.big-topbar-page {
   padding-top: 78px;
@@ skipping 314 matching lines @@
 
 .site-results .domain {
   display: none;
 }
 
 html[dir='rtl'] .number-visits {
   /* This element contains parentheses, which without the unicode-bidi: embed
    * directive would show up incorrectly (e.g. '(www.google.com (5'). Using
    * 'embed' makes the engine set the text in the parentheses as LTR even
    * when the layout is set to RTL, which makes using -webkit-*-start
-   * impossible. So use margins and dir='rtl'.
-   */
+   * impossible. So use margins and dir='rtl'. */
   direction: rtl;
   unicode-bidi: embed;
 }
 
 .number-visits {
   color: rgb(151, 156, 160);
 }
 
 .drop-down {
   margin-top: 1px;
@@ skipping 285 matching lines @@
 
 #action-menu[data-devicetype='phone']::before {
   background-image: url(../../../../ui/webui/resources/images/smartphone.svg);
   background-position: 14px center;
   padding-left: 43px;
 }
 
 #action-menu[data-devicetype='tablet']::before {
   background-image: url(../../../../ui/webui/resources/images/tablet.svg);
 }