Oilpan: move DOM string collection objects to the Oilpan heap.

Source/core/dom/ContainerNode.h

Index: Source/core/dom/ContainerNode.h
diff --git a/Source/core/dom/ContainerNode.h b/Source/core/dom/ContainerNode.h
index 8de4bf92f8dc6a8325d967b2cd9437bb419f130f..907723bad842509347bdb66ddd0ac5b9909fbdba 100644
--- a/Source/core/dom/ContainerNode.h
+++ b/Source/core/dom/ContainerNode.h
@@ -189,6 +189,8 @@ public:
 
     void disconnectDescendantFrames();
 
+    virtual void trace(Visitor* visitor) OVERRIDE { Node::trace(visitor); }

[Mads Ager (chromium), 2014/04/29 09:05:14]

If the only thing this trace method does is call the super trace method I don't
think you need it? But it doesn't hurt. I'm adding a trace method OVERRIDE here
in my next change anyway.

+
 protected:
     ContainerNode(TreeScope*, ConstructionType = CreateContainer);