NTP: Allow hiding tips and bookmark sync....

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 {
   background: url(chrome://theme/product_logo) no-repeat 0 6px;
   position: relative;
   margin: 0 auto;
   width: 920px;
+  min-height: 50px;
   -webkit-transition: width .15s;
 }
 
 html[dir='rtl'] #main {
   background-position-x: 100%;
 }
 
 html[anim='false'] *,
 .no-anim, .no-anim *,
 .loading * {
@@ skipping 436 matching lines @@
   width: auto;
   max-width: 300px;
 }
 
 .hbox {
   display: -webkit-box;
   -webkit-box-orient: horizontal;
 }
 
 #recently-closed {
-  -webkit-transition: opacity .15s;
   background-color: hsla(213, 60%, 92%, .4);
   border: 1px solid hsl(213, 60%, 92%);
   -webkit-border-radius: 5px;
   padding: 5px 0px;
   white-space: nowrap;
   overflow-x: hidden;
 }
 
 #recently-closed > * {
   display: inline-block;
@@ skipping 194 matching lines @@
 .list > .thumbnail-container {
   max-width: 920px;
 }
 
 /* tip line */
 #tip-line {
   margin: 10px 0;
   text-align: center;
 }
 
+#attribution {
+  margin: 10px 0;
+}
+
 #themes-promo {
   position: absolute;
   bottom: 0px;
   right: 0px;
 }
 
 #themes-promo * {
   display: block;
 }
 
@@ skipping 34 matching lines @@
   }
 
   #notification > * {
     max-width: 300px;
   }
 
   #notification > span > .blacklist-title {
     max-width: 15ex;
   }
 }