<fieldset> should be ignored in interactive validation

Source/core/html/HTMLFormControlElement.cpp

Index: Source/core/html/HTMLFormControlElement.cpp
diff --git a/Source/core/html/HTMLFormControlElement.cpp b/Source/core/html/HTMLFormControlElement.cpp
index 92667795a8a6e3a4a6594f2cc2ce414b2930150b..c278df42004ccfa97645b66093b82a63d2b080bd 100644
--- a/Source/core/html/HTMLFormControlElement.cpp
+++ b/Source/core/html/HTMLFormControlElement.cpp
@@ -524,6 +524,14 @@ bool HTMLFormControlElement::checkValidity(WillBeHeapVector<RefPtrWillBeMember<H
     return false;
 }
 
+bool HTMLFormControlElement::isSubmittableElement()
+{
+    if (this->formControlType() == "fieldset")

[tkent, 2015/06/25 11:30:02]

No, HTMLFormControlElement should not have knowledge of specific elements.
isSubmittableElement() should be a virtual function. 
HTMLFormControlElement::isSubmittableElement() should return true, and
HTMLFieldSetElement::isSubmittableElement() should return false.

[tanay.c, 2015/06/25 12:04:56]

Done.

+        return false;
+
+    return true;
+}
+
 void HTMLFormControlElement::showValidationMessage()
 {
     scrollIntoViewIfNeeded(false);