Move HTMLTable*Element.insert{Row,Cell}'s argument default into IDL file

Source/core/html/HTMLTableSectionElement.cpp

Index: Source/core/html/HTMLTableSectionElement.cpp
diff --git a/Source/core/html/HTMLTableSectionElement.cpp b/Source/core/html/HTMLTableSectionElement.cpp
index 401ca53d2d71f96940c08e690b289bbbff5f2397..675d480a2ba45984584edd922a10d97d5a23479d 100644
--- a/Source/core/html/HTMLTableSectionElement.cpp
+++ b/Source/core/html/HTMLTableSectionElement.cpp
@@ -53,12 +53,6 @@ const StylePropertySet* HTMLTableSectionElement::additionalPresentationAttribute
     return 0;
 }
 
-PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableSectionElement::insertRow(ExceptionState& exceptionState)
-{
-    // The default 'index' argument value is -1.
-    return insertRow(-1, exceptionState);
-}
-
 // these functions are rather slow, since we need to get the row at
 // the index... but they aren't used during usual HTML parsing anyway
 PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableSectionElement::insertRow(int index, ExceptionState& exceptionState)