Oilpan: move custom element objects to the heap.

Source/core/dom/custom/CustomElementRegistrationContext.cpp

Index: Source/core/dom/custom/CustomElementRegistrationContext.cpp
diff --git a/Source/core/dom/custom/CustomElementRegistrationContext.cpp b/Source/core/dom/custom/CustomElementRegistrationContext.cpp
index 678895007f962e9457652206e89b5fc6516491e9..f6ce6c52a1dabfde095eed9afc6239373e261863 100644
--- a/Source/core/dom/custom/CustomElementRegistrationContext.cpp
+++ b/Source/core/dom/custom/CustomElementRegistrationContext.cpp
@@ -45,6 +45,11 @@
 
 namespace WebCore {
 
+CustomElementRegistrationContext::CustomElementRegistrationContext()
+    : m_candidates(CustomElementUpgradeCandidateMap::create())
+{
+}
+
 void CustomElementRegistrationContext::registerElement(Document* document, CustomElementConstructorBuilder* constructorBuilder, const AtomicString& type, CustomElement::NameSet validNames, ExceptionState& exceptionState)
 {
     CustomElementDefinition* definition = m_registry.registerElement(document, constructorBuilder, type, validNames, exceptionState);
@@ -53,8 +58,11 @@ void CustomElementRegistrationContext::registerElement(Document* document, Custo
         return;
 
     // Upgrade elements that were waiting for this definition.
-    const CustomElementUpgradeCandidateMap::ElementSet& upgradeCandidates = m_candidates.takeUpgradeCandidatesFor(definition->descriptor());
-    for (CustomElementUpgradeCandidateMap::ElementSet::const_iterator it = upgradeCandidates.begin(); it != upgradeCandidates.end(); ++it)
+    const CustomElementUpgradeCandidateMap::ElementSet* upgradeCandidates = m_candidates->takeUpgradeCandidatesFor(definition->descriptor());
+    if (!upgradeCandidates)
+        return;
+
+    for (CustomElementUpgradeCandidateMap::ElementSet::const_iterator it = upgradeCandidates->begin(); it != upgradeCandidates->end(); ++it)
         CustomElement::define(*it, definition);
 }
 
@@ -105,15 +113,10 @@ void CustomElementRegistrationContext::resolve(Element* element, const CustomEle
         CustomElement::define(element, definition);
     } else {
         ASSERT(element->customElementState() == Element::WaitingForUpgrade);
-        m_candidates.add(descriptor, element);
+        m_candidates->add(descriptor, element);
     }
 }
 
-PassRefPtr<CustomElementRegistrationContext> CustomElementRegistrationContext::create()
-{
-    return adoptRef(new CustomElementRegistrationContext());
-}
-
 void CustomElementRegistrationContext::setIsAttributeAndTypeExtension(Element* element, const AtomicString& type)
 {
     ASSERT(element);
@@ -150,4 +153,9 @@ void CustomElementRegistrationContext::setTypeExtension(Element* element, const
     context->didGiveTypeExtension(element, type);
 }
 
+void CustomElementRegistrationContext::trace(Visitor* visitor)
+{
+    visitor->trace(m_candidates);
+}
+
 } // namespace WebCore