Oilpan: Prepare to move FormAssociatedElement to Oilpan heap, part 1.

Source/core/html/HTMLFormElement.cpp

Index: Source/core/html/HTMLFormElement.cpp
diff --git a/Source/core/html/HTMLFormElement.cpp b/Source/core/html/HTMLFormElement.cpp
index 703d3eff1396ba351ddb297e8cf4ffd1a352dd28..b74f5da1e9ad76128771ef1f5bb2956cd9f72c7f 100644
--- a/Source/core/html/HTMLFormElement.cpp
+++ b/Source/core/html/HTMLFormElement.cpp
@@ -251,7 +251,7 @@ bool HTMLFormElement::validateInteractively(Event* event)
             toHTMLFormControlElement(elements[i])->hideVisibleValidationMessage();
     }
 
-    Vector<RefPtr<FormAssociatedElement> > unhandledInvalidControls;
+    WillBeHeapVector<RefPtrWillBeMember<FormAssociatedElement> > unhandledInvalidControls;
     if (!checkInvalidControlsAndCollectUnhandled(&unhandledInvalidControls))
         return true;
     // Because the form has invalid controls, we abort the form submission and
@@ -645,13 +645,13 @@ bool HTMLFormElement::checkValidity()
     return !checkInvalidControlsAndCollectUnhandled(0);
 }
 
-bool HTMLFormElement::checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<FormAssociatedElement> >* unhandledInvalidControls)
+bool HTMLFormElement::checkInvalidControlsAndCollectUnhandled(WillBeHeapVector<RefPtrWillBeMember<FormAssociatedElement> >* unhandledInvalidControls)
 {
     RefPtr<HTMLFormElement> protector(this);
     // Copy associatedElements because event handlers called from
     // HTMLFormControlElement::checkValidity() might change associatedElements.
     const Vector<FormAssociatedElement*>& associatedElements = this->associatedElements();
-    Vector<RefPtr<FormAssociatedElement> > elements;
+    WillBeHeapVector<RefPtrWillBeMember<FormAssociatedElement> > elements;
     elements.reserveCapacity(associatedElements.size());
     for (unsigned i = 0; i < associatedElements.size(); ++i)
         elements.append(associatedElements[i]);