Cleanup: fix some CSS comment styles (especially copyrights)

chrome/browser/resources/local_ntp/most_visited_single.css

 /* Copyright 2015 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. */
 
 body {
   -webkit-user-select: none;
   background: none transparent;
   color: #323232;
   margin: 0;
   overflow: hidden;
@@ skipping 222 matching lines @@
 .icon-ntp .mv-thumb,
 .icon-ntp .mv-thumb-fallback {
   background: transparent;
   height: 48px;
   left: 50%;
   margin-left: -24px;
   top: 18px;
   width: 48px;
 }
 
-/*
-  We use ::after without content to provide an aditional element on top of
-  the thumbnail.
-*/
+/* We use ::after without content to provide an aditional element on top of the
+ * thumbnail. */
 .mv-thumb.failed-img::after {
   border: 8px solid #f2f2f2;
   border-radius: 50%;
   content: '';
   display: block;
   height: 0;
   margin: 39px 66px;
   width: 0;
 }
 
@@ skipping 13 matching lines @@
 }
 
 .icon-ntp .mv-x {
   background: none;
   height: 16px;
   right: 10px;
   top: 10px;
   width: 16px;
 }
 
-/*
-  We use ::after without content to provide the masked X element.
-  The "bottom" div is actually just the gradient.
-*/
+/* We use ::after without content to provide the masked X element. The "bottom"
+ * div is actually just the gradient. */
 .mv-x::after {
   -webkit-mask-image: -webkit-image-set(
       url(chrome-search://local-ntp/images/close_3_mask.png) 1x,
       url(chrome-search://local-ntp/images/close_3_mask.png@2x) 2x);
   -webkit-mask-position: 12px 10px;
   -webkit-mask-repeat: no-repeat;
   -webkit-mask-size: 10px 10px;
   background-color: rgba(90,90,90,0.7);
   content: '';
   display: block;
@@ skipping 80 matching lines @@
 }
 
 .mv-favicon img {
   height: 100%;
   width: 100%;
 }
 
 .mv-favicon.failed-favicon img {
   display: none;
 }