Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/Canvas2DContextAttributes.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
@@ skipping 21 matching lines @@
 
 namespace blink {
 
 Canvas2DContextAttributes::Canvas2DContextAttributes()
     : m_alpha(true)
     , m_storage(PersistentStorage)
 {
     ScriptWrappable::init(this);
 }
 
-Canvas2DContextAttributes::~Canvas2DContextAttributes()
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(Canvas2DContextAttributes);
+
+PassRefPtrWillBeRawPtr<Canvas2DContextAttributes> Canvas2DContextAttributes::create()
 {
-}
-
-PassRefPtr<Canvas2DContextAttributes> Canvas2DContextAttributes::create()
-{
-    return adoptRef(new Canvas2DContextAttributes());
+    return adoptRefWillBeNoop(new Canvas2DContextAttributes());
 }
 
 bool Canvas2DContextAttributes::alpha() const
 {
     return m_alpha;
 }
 
 void Canvas2DContextAttributes::setAlpha(bool alpha)
 {
     m_alpha = alpha;
@@ skipping 11 matching lines @@
     else if (storage == "discardable")
         m_storage = DiscardableStorage;
 }
 
 Canvas2DContextStorage Canvas2DContextAttributes::parsedStorage() const
 {
     return m_storage;
 }
 
 } // namespace blink