Oilpan: move node/element rare data objects to the heap.

Source/core/dom/shadow/ElementShadow.cpp

Index: Source/core/dom/shadow/ElementShadow.cpp
diff --git a/Source/core/dom/shadow/ElementShadow.cpp b/Source/core/dom/shadow/ElementShadow.cpp
index 8be13446f18645649efdd25a428a4ea025891357..e8ddc164f940ed5ef9999151a2fd21dce3ad2ba1 100644
--- a/Source/core/dom/shadow/ElementShadow.cpp
+++ b/Source/core/dom/shadow/ElementShadow.cpp
@@ -122,9 +122,9 @@ inline void DistributionPool::detachNonDistributedNodes()
     }
 }
 
-PassOwnPtr<ElementShadow> ElementShadow::create()
+PassOwnPtrWillBeRawPtr<ElementShadow> ElementShadow::create()
 {
-    return adoptPtr(new ElementShadow());
+    return adoptPtrWillBeNoop(new ElementShadow());
 }
 
 ElementShadow::ElementShadow()
@@ -165,6 +165,9 @@ ShadowRoot& ElementShadow::addShadowRoot(Element& shadowHost, ShadowRoot::Shadow
 
 void ElementShadow::removeDetachedShadowRoots()
 {
+    // With Oilpan, the Element shadow roots may have been finalized
+    // during the same sweep. Do not access, but do the minimum
+    // necessary/allowed, just clearing the list of roots.

[haraken, 2014/05/07 02:10:26]

ElementShadow::removeDetachedShadowRoots() is not called in oilpan builds. You
can remove the comment and add !ENABLE(OILPAN) to
ElementShadow::removeDetachedShadowRoots().

[sof, 2014/05/07 07:01:01]

Will remove comment.

     // Dont protect this ref count.
     Element* shadowHost = host();
     ASSERT(shadowHost);
@@ -178,7 +181,6 @@ void ElementShadow::removeDetachedShadowRoots()
         oldRoot->setPrev(0);
         oldRoot->setNext(0);
     }
-
 }
 
 void ElementShadow::attach(const Node::AttachContext& context)