Oilpan: have xml/ objects on the heap by default.

Source/core/xml/XSLImportRule.h

Index: Source/core/xml/XSLImportRule.h
diff --git a/Source/core/xml/XSLImportRule.h b/Source/core/xml/XSLImportRule.h
index 388f91aa1fa55ab9d267d470f9fe556db9209b13..e9f70fed1469bfc1fd067906bc7f384e114592fb 100644
--- a/Source/core/xml/XSLImportRule.h
+++ b/Source/core/xml/XSLImportRule.h
@@ -30,13 +30,12 @@
 
 namespace blink {
 
-class XSLImportRule final : public NoBaseWillBeGarbageCollectedFinalized<XSLImportRule> {
-    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(XSLImportRule);
+class XSLImportRule final : public GarbageCollectedFinalized<XSLImportRule> {
 public:
-    static PassOwnPtrWillBeRawPtr<XSLImportRule> create(XSLStyleSheet* parentSheet, const String& href)
+    static XSLImportRule* create(XSLStyleSheet* parentSheet, const String& href)
     {
         ASSERT(RuntimeEnabledFeatures::xsltEnabled());
-        return adoptPtrWillBeNoop(new XSLImportRule(parentSheet, href));
+        return new XSLImportRule(parentSheet, href);
     }
 
     virtual ~XSLImportRule();