60325 "<hr> line-height problem caused by large font size". Set the HR font-size to -moz-initial r=glazman/sr=attinasi

layout/html/document/src/quirk.css

@@ -275,6 +275,7 @@ hr {
   display: inline;
   -moz-box-sizing: border-box;
   margin: 0 0.1% 0 0.1%; /* Mmm! Hack-on-a-hack for bug 81776 */
+  font-size: -moz-initial !important;
 }
 
 hr:before {

layout/style/quirk.css

@@ -275,6 +275,7 @@ hr {
   display: inline;
   -moz-box-sizing: border-box;
   margin: 0 0.1% 0 0.1%; /* Mmm! Hack-on-a-hack for bug 81776 */
+  font-size: -moz-initial !important;
 }
 
 hr:before {