[Wallpaper Picker] Fixed non clickable author website URLs

chrome/browser/resources/chromeos/wallpaper_manager/css/wallpaper_manager.css

 /* Copyright (c) 2013 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 {
   height: 100%;
 }
 
 body {
   -webkit-app-region: drag;
   background-color: rgba(20, 20, 20, 0.93);
   color: #999;
   font-size: 80%;
   height: 100%;
   margin: 0;
   padding: 0;
 }
 
 /* Click events are not received in draggable area. Making all clickable areas
  * not draggable to receive click events.
  * TODO(bshe): Remove this when http://crbug.com/142275 fixed.
  */
 .dialog-topbar #navstrip,
 .dialog-topbar #window-close-button,
 .image-picker,
 .overlay-container .page,
+#author-website,
 #surprise-me {
   -webkit-app-region: no-drag;
 }
 
 .dialog-container {
   -webkit-box-orient: vertical;
   display: -webkit-box;
   overflow: hidden;
 }
 
@@ skipping 295 matching lines @@
   margin-right: 4px;
   opacity: 0.7;
   position: relative;
   top: 4px;
   width: 17px;
 }
 
 #surprise-me #checkbox.checked {
   background-image: url('../images/ui/checkbox_checked.png');
 }