Make CharacterData::insertData() / deleteData() / replaceData() arguments mandatory

Source/core/dom/CharacterData.idl

Index: Source/core/dom/CharacterData.idl
diff --git a/Source/core/dom/CharacterData.idl b/Source/core/dom/CharacterData.idl
index 6b249e5764f2cd0a1bec96cc1c8e5dd25176bb0b..eb9409f407a5e47f18a0426adf13334e3775ef0f 100644
--- a/Source/core/dom/CharacterData.idl
+++ b/Source/core/dom/CharacterData.idl
@@ -26,16 +26,9 @@ interface CharacterData : Node {
     [TreatReturnedNullStringAs=Null, RaisesException] DOMString substringData([IsIndex,Default=Undefined] optional unsigned long offset, [IsIndex,Default=Undefined] optional unsigned long length);
 
     void appendData(DOMString data);
-
-     [RaisesException] void insertData([IsIndex,Default=Undefined] optional unsigned long offset,
-                                   [Default=Undefined] optional DOMString data);
-
-     [RaisesException] void deleteData([IsIndex,Default=Undefined] optional unsigned long offset,
-                                   [IsIndex,Default=Undefined] optional unsigned long length);
-
-     [RaisesException] void replaceData([IsIndex,Default=Undefined] optional unsigned long offset,
-                                    [IsIndex,Default=Undefined] optional unsigned long length,
-                                    [Default=Undefined] optional DOMString data);
+    [RaisesException] void insertData([IsIndex] unsigned long offset, DOMString data);

[do-not-use, 2013/08/01 12:42:10]

Note that I kept the [IsIndex] extended attributes even though this is no longer
according to spec:
http://dom.spec.whatwg.org/#dom-characterdata-replacedata

This is out of scope for this patch but I would like to remove them in a
follow-up patch.

Since the type is unsigned long, passing a negative value should simply get
converted using toUint32() as per the Web IDL specification (step 4 in
http://dev.w3.org/2006/webapi/WebIDL/#es-unsigned-long).

The [IsIndex] extended attribute should probably completely disappear in the
near future.

+    [RaisesException] void deleteData([IsIndex] unsigned long offset, unsigned long length);
+    [RaisesException] void replaceData([IsIndex] unsigned long offset, unsigned long length, DOMString data);
 };
 
 CharacterData implements ChildNode;