[New Tab Page] Local NTP: bound the size of favicon image.

chrome/browser/resources/local_ntp/local_ntp.css

Index: chrome/browser/resources/local_ntp/local_ntp.css
diff --git a/chrome/browser/resources/local_ntp/local_ntp.css b/chrome/browser/resources/local_ntp/local_ntp.css
index bc6783f9a90ec29b603b13f85a32929db7a340d1..4804f624868367be04880818828c977caf921d4b 100644
--- a/chrome/browser/resources/local_ntp/local_ntp.css
+++ b/chrome/browser/resources/local_ntp/local_ntp.css
@@ -594,6 +594,11 @@ html[dir=rtl] .thumb-ntp .mv-favicon {
   background-size: 16px 16px;
 }
 
+.mv-favicon img {
+  height: 100%;
+  width: 100%;
+}
+
 /* The notification shown when a tile is blacklisted. */
 #mv-notice {
   font-size: 12px;