Oilpan: Move core/xml/ to oilpan's heap

Source/core/xml/XMLHttpRequest.h

Index: Source/core/xml/XMLHttpRequest.h
diff --git a/Source/core/xml/XMLHttpRequest.h b/Source/core/xml/XMLHttpRequest.h
index 6cd13dc0f5f4985c47ec79d02e8e37a176e920a6..8cf83cdcfea2e421fae73d3110783bff0d6c4753 100644
--- a/Source/core/xml/XMLHttpRequest.h
+++ b/Source/core/xml/XMLHttpRequest.h
@@ -30,6 +30,7 @@
 #include "core/loader/ThreadableLoaderClient.h"
 #include "core/xml/XMLHttpRequestEventTarget.h"
 #include "core/xml/XMLHttpRequestProgressEventThrottle.h"
+#include "heap/Handle.h"
 #include "platform/AsyncMethodRunner.h"
 #include "platform/network/FormData.h"
 #include "platform/network/ResourceResponse.h"
@@ -53,11 +54,12 @@ class ThreadableLoader;
 
 typedef int ExceptionCode;
 
-class XMLHttpRequest FINAL : public ScriptWrappable, public RefCounted<XMLHttpRequest>, public XMLHttpRequestEventTarget, private ThreadableLoaderClient, public ActiveDOMObject {
-    WTF_MAKE_FAST_ALLOCATED;
-    REFCOUNTED_EVENT_TARGET(XMLHttpRequest);
+class XMLHttpRequest FINAL : public RefCountedWillBeRefCountedGarbageCollected<XMLHttpRequest>, public ScriptWrappable, public XMLHttpRequestEventTarget, private ThreadableLoaderClient, public ActiveDOMObject {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
+    DECLARE_GC_INFO;
+    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<XMLHttpRequest>);
 public:
-    static PassRefPtr<XMLHttpRequest> create(ExecutionContext*, PassRefPtr<SecurityOrigin> = 0);
+    static PassRefPtrWillBeRawPtr<XMLHttpRequest> create(ExecutionContext*, PassRefPtr<SecurityOrigin> = 0);
     virtual ~XMLHttpRequest();
 
     // These exact numeric values are important because JS expects them.
@@ -143,6 +145,8 @@ public:
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(readystatechange);
 
+    void trace(Visitor*) { }
+
 private:
     XMLHttpRequest(ExecutionContext*, PassRefPtr<SecurityOrigin>);