Make CSSStyleDeclaration function arguments non-optional

Source/core/css/CSSStyleDeclaration.idl

Index: Source/core/css/CSSStyleDeclaration.idl
diff --git a/Source/core/css/CSSStyleDeclaration.idl b/Source/core/css/CSSStyleDeclaration.idl
index b1c354cddf6b058fe6a38576ca104fc474b9152a..4def0755528ded19e7d79236cb94336da647bca6 100644
--- a/Source/core/css/CSSStyleDeclaration.idl
+++ b/Source/core/css/CSSStyleDeclaration.idl
@@ -25,15 +25,15 @@
 ] interface CSSStyleDeclaration {
     [RaisesException=Setter] attribute DOMString?       cssText;
 
-    DOMString?          getPropertyValue([Default=Undefined] optional DOMString propertyName);
-    [RaisesException] DOMString?          removeProperty([Default=Undefined] optional DOMString propertyName);
-    DOMString?          getPropertyPriority([Default=Undefined] optional DOMString propertyName);
-    [RaisesException] void setProperty([Default=Undefined] optional DOMString propertyName,
-                                       [Default=Undefined] optional DOMString? value,
+    DOMString?          getPropertyValue(DOMString propertyName);
+    [RaisesException] DOMString?          removeProperty(DOMString propertyName);
+    DOMString?          getPropertyPriority(DOMString propertyName);
+    [RaisesException] void setProperty(DOMString propertyName,
+                                       DOMString? value,
                                        optional DOMString? priority = null);
 
     readonly attribute unsigned long    length;
-    getter DOMString          item([Default=Undefined] optional unsigned long index);
+    getter DOMString          item(unsigned long index);
     [Custom=(PropertyGetter,PropertyEnumerator,PropertyQuery)] getter (DOMString or float) (DOMString name);
     [Custom] setter void (DOMString propertyName, DOMString? propertyValue);
     readonly attribute CSSRule          parentRule;