NTP: Hide "Make this my home page" after setting the home page....

chrome/browser/resources/new_new_tab.css

 html {
   /* This is needed because of chrome://theme/css/new_tab.css */
   height: 100%;
 }
 
 body {
   margin: 0;
 }
 
 #main {
@@ skipping 503 matching lines @@
 #sync-status > * {
   display: inline-block;
   max-width: none;
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
   font-size: 100%;
   margin: 0 10px;
 }
 
-#set-as-homepage {
+#set-as-home-page {
   display: none;
   margin: 10px 0;
   text-align: center;
 }
 
 #view-toolbar {
   -webkit-user-select: none;
   text-align: right;
   position: relative;
   top: 15px;
@@ skipping 199 matching lines @@
   }
 
   #notification > * {
     max-width: 300px;
   }
 
   #notification > span > .blacklist-title {
     max-width: 15ex;
   }
 }