fix for bug 71852 sr=hyatt

fix trees by adding -xul to css property, so that scrolled boxes inherit their attributes appropriately

layout/html/document/src/html.css

@@ -416,7 +416,7 @@ noscript, noframes, param, :-moz-comment, :-moz-pi {
   background: inherit;
   padding: inherit;
   display: inherit;
-  -moz-box-orient: inherit;
+  -moz-xul-box-orient: inherit;
 }
 
 :wrapped-frame {

layout/style/html.css

@@ -416,7 +416,7 @@ noscript, noframes, param, :-moz-comment, :-moz-pi {
   background: inherit;
   padding: inherit;
   display: inherit;
-  -moz-box-orient: inherit;
+  -moz-xul-box-orient: inherit;
 }
 
 :wrapped-frame {