Updated to Chrome 45 (2454) moved from SVN to git.

core/html/HTMLButtonElement.idl

Index: core/html/HTMLButtonElement.idl
diff --git a/core/html/HTMLButtonElement.idl b/core/html/HTMLButtonElement.idl
index 7845755cff043ba4c5ade1f803b1fec5c12eccdc..6ab20ee99aa5ea06bb9e092c98529a4c26bb44dd 100644
--- a/core/html/HTMLButtonElement.idl
+++ b/core/html/HTMLButtonElement.idl
@@ -18,10 +18,12 @@
  * Boston, MA 02110-1301, USA.
  */
 
+// https://html.spec.whatwg.org/#the-button-element
+
 interface HTMLButtonElement : HTMLElement {
     [Reflect] attribute boolean autofocus;
     [Reflect] attribute boolean disabled;
-    [ImplementedAs=formOwner] readonly attribute HTMLFormElement form;
+    [ImplementedAs=formOwner] readonly attribute HTMLFormElement? form;
     [Reflect, URL] attribute DOMString formAction;
     attribute DOMString formEnctype;
     attribute DOMString formMethod;
@@ -30,12 +32,14 @@ interface HTMLButtonElement : HTMLElement {
     [Reflect] attribute DOMString name;
     attribute DOMString type;
     [Reflect] attribute DOMString value;
+    // FIXME: attribute HTMLMenuElement? menu;
 
     readonly attribute boolean willValidate;
     readonly attribute ValidityState validity;
     readonly attribute DOMString validationMessage;
     boolean checkValidity();
-    void setCustomValidity([TreatUndefinedAs=NullString] DOMString? error);
+    boolean reportValidity();
+    void setCustomValidity(DOMString error);
 
     readonly attribute NodeList labels;
 };