Oilpan: Prepare to move IdTargetObserver and IdTargetObserverRegistry to Oilpan heap.

Source/core/html/HTMLInputElement.h

Index: Source/core/html/HTMLInputElement.h
diff --git a/Source/core/html/HTMLInputElement.h b/Source/core/html/HTMLInputElement.h
index 6c4f20eedff8b5111caad7e59b39833fd69a926d..7980046e3f187f18273080c175de7d24999ca6e5 100644
--- a/Source/core/html/HTMLInputElement.h
+++ b/Source/core/html/HTMLInputElement.h
@@ -361,7 +361,7 @@ private:
 
     virtual void subtreeHasChanged() OVERRIDE FINAL;
 
-    void setListAttributeTargetObserver(PassOwnPtr<ListAttributeTargetObserver>);
+    void setListAttributeTargetObserver(PassOwnPtrWillBeRawPtr<ListAttributeTargetObserver>);
     void resetListAttributeTargetObserver();
     void parseMaxLengthAttribute(const AtomicString&);
     void updateValueIfNeeded();
@@ -401,7 +401,7 @@ private:
     // that it lives as long as its owning element lives. If we move the loader into
     // the ImageInput object we may delete the loader while this element lives on.
     OwnPtr<HTMLImageLoader> m_imageLoader;
-    OwnPtr<ListAttributeTargetObserver> m_listAttributeTargetObserver;
+    OwnPtrWillBeMember<ListAttributeTargetObserver> m_listAttributeTargetObserver;
 };
 
 } //namespace