Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/presentation/PresentationSessionClientCallbacks.h

Index: Source/modules/presentation/PresentationSessionClientCallbacks.h
diff --git a/Source/modules/presentation/PresentationSessionClientCallbacks.h b/Source/modules/presentation/PresentationSessionClientCallbacks.h
index 6ac5230807e9cf5b4cd5f1e4e85a8fa89fcea091..193d92643038ad050f3a15fe8b9dbcd4551637cf 100644
--- a/Source/modules/presentation/PresentationSessionClientCallbacks.h
+++ b/Source/modules/presentation/PresentationSessionClientCallbacks.h
@@ -8,8 +8,6 @@
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/presentation/WebPresentationClient.h"
 #include "wtf/Noncopyable.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefPtr.h"
 
 namespace blink {
 
@@ -27,7 +25,7 @@ class ScriptPromiseResolver;
 class PresentationSessionClientCallbacks final : public WebPresentationSessionClientCallbacks {
     WTF_MAKE_NONCOPYABLE(PresentationSessionClientCallbacks);
 public:
-    PresentationSessionClientCallbacks(PassRefPtrWillBeRawPtr<ScriptPromiseResolver>, Presentation*);
+    PresentationSessionClientCallbacks(ScriptPromiseResolver*, Presentation*);
     ~PresentationSessionClientCallbacks() override;
 
     // WebPresentationSessionClientCallbacks implementation.
@@ -35,7 +33,7 @@ public:
     void onError(WebPresentationError*) override;
 
 private:
-    RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
+    Persistent<ScriptPromiseResolver> m_resolver;
     Persistent<Presentation> m_presentation;
 };