Implement layout of NTP apps promo.

chrome/browser/resources/new_tab_theme.css

 html,
 .section > h2 span,
 #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;
 }
 
@@ skipping 119 matching lines @@
 }
 
 .app a {
   color: $8; /* COLOR_NTP_TEXT */
 }
 
 .app:hover > a {
   color: $$3; /* COLOR_NTP_SECTION_TEXT */
   background-color: $$1; /* COLOR_NTP_SECTION */;
 }
+
+#apps-promo-hide {
+  color: $9; /* COLOR_NTP_LINK */
+}
+
+#apps-promo-text2 {
+  color: $$$3; /* COLOR_NTP_TEXT_LIGHT */
+}