Fix layout glitches in NTP. Also, lots of naming cleanup.

chrome/browser/resources/ntp/most_visited.css

 /* Most Visited */
 
 #most-visited-maxiview {
   position: relative;
   height: 366px;
   -webkit-user-select: none;
 }
 
 .thumbnail-container {
   position: absolute;
@@ skipping 256 matching lines @@
   visibility: hidden;
   -webkit-padding-start: 3px;
   z-index: 3;
 }
 
 html[dir=rtl] #most-visited-settings {
   left: 0;
   right: auto;
 }
 
-#most-visited:not(.hidden) #most-visited-settings.has-blacklist {
+#most-visited:not(.collapsed) #most-visited-settings.has-blacklist {
   visibility: visible;
 }