Oilpan: cleanup based on review comments after removal of TreeShared.

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 9bc9d1d066208c6f0da2f899a2b25720ddcf877d..484162b1199099c17414985d738e79702e43d62f 100644
--- a/Source/core/html/HTMLFormControlElement.cpp
+++ b/Source/core/html/HTMLFormControlElement.cpp
@@ -65,7 +65,6 @@ HTMLFormControlElement::~HTMLFormControlElement()
 {
 #if !ENABLE(OILPAN)
     setForm(0);
-    hideVisibleValidationMessage();

[haraken, 2014/05/07 12:50:20]

tkent-san: I'm not sure if we can remove this. See
https://codereview.chromium.org/262093006/diff/150001/Source/core/html/HTMLFo...

[Mads Ager (chromium), 2014/05/08 09:08:59]

Kent confirmed that this can be removed on the other code review where I asked a
similar question.

 #endif
 }
 
@@ -423,8 +422,8 @@ bool HTMLFormControlElement::checkValidity(Vector<RefPtr<FormAssociatedElement>
     if (!willValidate() || isValidFormControlElement())
         return true;
     // An event handler can deref this object.
-    RefPtr<HTMLFormControlElement> protector(this);
-    RefPtr<Document> originalDocument(document());
+    RefPtrWillBeRawPtr<HTMLFormControlElement> protector(this);
+    RefPtrWillBeRawPtr<Document> originalDocument(document());
     bool needsDefaultAction = dispatchEvent(Event::createCancelable(EventTypeNames::invalid));
     if (needsDefaultAction && unhandledInvalidControls && inDocument() && originalDocument == document())
         unhandledInvalidControls->append(this);