ntp4: Most Visited appearance refresh

chrome/browser/resources/ntp4/new_tab_theme.css

 html,
 #most-visited-settings {
   background-attachment: fixed;
   background-color: $2; /* COLOR_NTP_BACKGROUND */
   background-image: url(chrome://theme/IDR_THEME_NTP_BACKGROUND?$1);
   background-position: $3;
   background-repeat: $5;
 }
 
 body {
@@ skipping 59 matching lines @@
 }
 
 /* Most Visited ***************************************************************/
 
 .most-visited,
 .most-visited > .title {
   color: $8; /* COLOR_NTP_TEXT */
 }
 
 .most-visited:focus:not(.filler) .thumbnail-wrapper,
-.most-visited:hover .thumbnail-wrapper {
+.most-visited:hover:not(.filler) .thumbnail-wrapper {
   background-color: $6; /* COLOR_NTP_HEADER */
 }
 
 .edit-bar {
   background-image: -webkit-linear-gradient(
                         $7, /* COLOR_HEADER_GRADIENT_LIGHT */
                         $6); /* COLOR_NTP_HEADER */
 }
 
 .thumbnail-wrapper {
   /* This shows through at the (rounded) thumbnail's corners. */
   background-color: $11; /* COLOR_NTP_SECTION_BORDER */
 }
 
 .filler .thumbnail {
   border-color: $2; /* COLOR_NTP_BACKGROUND */
 }
-
-.thumbnail-shield {
-  background-color: $2; /* COLOR_NTP_BACKGROUND */
-}