Bug 416549 ��� MathML does not render properly with text-align:justify.

Patch by Fr��d��ric WANG <fwsmail35@aol.com>, r=karlt, sr=roc

layout/mathml/content/src/mathml.css

@@ -409,6 +409,7 @@ semantics > :not(:first-child) {
 *|*::-moz-mathml-anonymous-block {
   display: inline-block !important;
   position: static !important;
+  text-indent: 0;
 }
 
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