Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/events/BeforeUnloadEvent.h

Index: third_party/WebKit/Source/core/events/BeforeUnloadEvent.h
diff --git a/third_party/WebKit/Source/core/events/BeforeUnloadEvent.h b/third_party/WebKit/Source/core/events/BeforeUnloadEvent.h
index a4e49f42009c9890c0137cc9041fe1f927fce8ea..6a5ea63f6eba4cdb45ba8fbf8004e304eb2ff475 100644
--- a/third_party/WebKit/Source/core/events/BeforeUnloadEvent.h
+++ b/third_party/WebKit/Source/core/events/BeforeUnloadEvent.h
@@ -34,9 +34,9 @@ class BeforeUnloadEvent final : public Event {
 public:
     ~BeforeUnloadEvent() override;
 
-    static PassRefPtrWillBeRawPtr<BeforeUnloadEvent> create()
+    static RawPtr<BeforeUnloadEvent> create()
     {
-        return adoptRefWillBeNoop(new BeforeUnloadEvent);
+        return (new BeforeUnloadEvent);
     }
 
     bool isBeforeUnloadEvent() const override;