Adjusted the subscript height for the font.

gfx/src/windows/nsFontMetricsWin.cpp

@@ -2462,7 +2462,7 @@ HDC   dc1 = NULL;
 
   if (0 < ::GetOutlineTextMetrics(dc, sizeof(oMetrics), &oMetrics)) {
 //    mXHeight = NSToCoordRound(oMetrics.otmsXHeight * dev2app);  XXX not really supported on windows
-    mXHeight = NSToCoordRound((float)metrics.tmAscent * dev2app * 0.50f); // 50% of ascent, best guess for true type
+    mXHeight = NSToCoordRound((float)metrics.tmAscent * dev2app * 0.56f); // 50% of ascent, best guess for true type
     mSuperscriptOffset = NSToCoordRound(oMetrics.otmptSuperscriptOffset.y * dev2app);
     mSubscriptOffset = NSToCoordRound(oMetrics.otmptSubscriptOffset.y * dev2app);