Bug 1431964 part 6. Remove nsIDOMMozNamedAttrMap::GetLength. r=mccr8

MozReview-Commit-ID: 9GJmiVSI0bs

dom/base/nsDOMAttributeMap.cpp

@@ -383,14 +383,6 @@ nsDOMAttributeMap::Length() const
   return mContent->GetAttrCount();
 }
 
-nsresult
-nsDOMAttributeMap::GetLength(uint32_t *aLength)
-{
-  NS_ENSURE_ARG_POINTER(aLength);
-  *aLength = Length();
-  return NS_OK;
-}
-
 Attr*
 nsDOMAttributeMap::GetNamedItemNS(const nsAString& aNamespaceURI,
                                   const nsAString& aLocalName)

dom/interfaces/core/nsIDOMMozNamedAttrMap.idl

@@ -17,7 +17,6 @@ interface nsIDOMMozNamedAttrMap : nsISupports
                                   raises(DOMException);
   nsIDOMAttr                removeNamedItem(in DOMString name)
                                   raises(DOMException);
-  readonly attribute  unsigned long        length;
   // Introduced in DOM Level 2:
   nsIDOMAttr                setNamedItemNS(in nsIDOMAttr arg)
                                   raises(DOMException);

layout/inspector/inDOMView.cpp

@@ -674,10 +674,7 @@ inDOMView::AttributeChanged(nsIDocument* aDocument, dom::Element* aElement,
       return;
     }
     // get the number of attributes on this content node
-    nsCOMPtr<nsIDOMMozNamedAttrMap> attrs;
-    el->GetAttributes(getter_AddRefs(attrs));
-    uint32_t attrCount;
-    attrs->GetLength(&attrCount);
+    uint32_t attrCount = aElement->GetAttrCount();
 
     inDOMViewNode* contentNode = nullptr;
     int32_t contentRow;