Oilpan: move DOMWindow object to the oilpan heap.

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 902c46797b8dd1a007ef67fe80f682b318816d09..a20c265b8ae6db1ef8b6debd8b54eb0b5d03a5ea 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1555,7 +1555,7 @@ Vector<String> Internals::consoleMessageArgumentCounts(Document* document) const
     return result;
 }
 
-PassRefPtr<DOMWindow> Internals::openDummyInspectorFrontend(const String& url)
+PassRefPtrWillBeRawPtr<DOMWindow> Internals::openDummyInspectorFrontend(const String& url)
 {
     Page* page = contextDocument()->frame()->page();
     ASSERT(page);
@@ -2420,6 +2420,7 @@ ScriptPromise Internals::addOneToPromise(ExecutionContext* context, ScriptPromis
 
 void Internals::trace(Visitor* visitor)
 {
+    visitor->trace(m_frontendWindow);
     visitor->trace(m_runtimeFlags);
     visitor->trace(m_profilers);
 }