HTMLTableSectionElement.insertRow(0) / HTMLTableRowElement.insertCell(0) do not behave correctly

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 30af275fb286ad5abe094adbc35317c2e21e542d..43de272ad0c7ffdf663b9137083a9f6e81568f05 100644
--- a/Source/core/html/HTMLTableSectionElement.cpp
+++ b/Source/core/html/HTMLTableSectionElement.cpp
@@ -73,12 +73,10 @@ PassRefPtr<HTMLElement> HTMLTableSectionElement::insertRow(int index, ExceptionS
     }
 
     RefPtr<HTMLTableRowElement> row = HTMLTableRowElement::create(document());
-    if (numRows == index || index == -1) {
+    if (numRows == index || index == -1)
         appendChild(row, exceptionState);
-    } else {
-        Node* n = index ? children->item(index) : firstChild();
-        insertBefore(row, n, exceptionState);
-    }
+    else
+        insertBefore(row, children->item(index), exceptionState);
     return row.release();
 }