Bug 686581 - Disable theming in SVG images harder. r=longsonr

layout/reftests/svg/foreignObject-form-theme.svg

@@ -1,9 +1,9 @@
 <svg xmlns='http://www.w3.org/2000/svg' width='500' height='200'>
   <foreignObject width='500' height='500'>
     <div xmlns='http://www.w3.org/1999/xhtml'>
-      <button>this is a button inside of SVG</button>
+      <button style="-moz-appearance: button !important">this is a button inside of SVG</button>
       <br/>
-      <select>
+      <select style="-moz-appearance: menulist !important">
         <option>This is a menu inside of SVG</option>
         <option>a second menu option</option>
       </select>

layout/svg/base/src/svg.css

@@ -58,7 +58,7 @@ foreignObject {
 
 @media all and (-moz-is-resource-document) {
  foreignObject *|* {
-   -moz-appearance: none;
+   -moz-appearance: none !important;
  }
 }