HTMLTableCellElement type changed from signed to unsinged

Source/core/html/HTMLTableCellElement.idl

Index: Source/core/html/HTMLTableCellElement.idl
diff --git a/Source/core/html/HTMLTableCellElement.idl b/Source/core/html/HTMLTableCellElement.idl
index ef01b8c92bfdca3502392e4ec9e2270f2ba9d544..7a9a8d8e8c0f325729569e267b45f6befa9efc1b 100644
--- a/Source/core/html/HTMLTableCellElement.idl
+++ b/Source/core/html/HTMLTableCellElement.idl
@@ -21,9 +21,8 @@
 // https://html.spec.whatwg.org/#attributes-common-to-td-and-th-elements
 
 interface HTMLTableCellElement : HTMLElement {
-    // TODO(philipj): All long types should be unsigned long.
-    attribute long colSpan;
-    attribute long rowSpan;
+    attribute unsigned long colSpan;
+    attribute unsigned long rowSpan;
     // TODO(philipj): headers should be a [PutForwards=value] readonly attribute
     // DOMSettableTokenList.
     [Reflect, TreatNullAs=NullString] attribute DOMString headers;