Further refinement of style interfaces

dom/public/idl/css/CSSStyleDeclaration.idl

@@ -1,8 +1,10 @@
 
     interface CSSStyleDeclaration {
       wstring getPropertyValue(in wstring propertyName);
-      wstring getPropertyWeight(in wstring propertyName);
-      void setProperty(in wstring propertyName, in wstring value, in wstring weight);
+      wstring getPropertyPriority(in wstring propertyName);
+      void setProperty(in wstring propertyName, in wstring value, in wstring priority);
+      readonly attribute unsigned long length;
+      wstring item(in unsigned long index); /* Returns property name */
 
       attribute wstring azimuth;
       attribute wstring background;

dom/public/idl/css/CSSStyleSheet.idl

@@ -5,7 +5,6 @@
       readonly attribute wstring href;
 
       readonly attribute StyleSheetCollection imports;
-      readonly attribute MediaGroupCollection mediaGroups;
       readonly attribute CSSStyleRuleCollection rules;
 
       unsigned long addRule(in wstring selector, in wstring declaration, in unsigned long index);