Oilpan: fix build after r353269.

third_party/WebKit/Source/modules/presentation/Presentation.h

Index: third_party/WebKit/Source/modules/presentation/Presentation.h
diff --git a/third_party/WebKit/Source/modules/presentation/Presentation.h b/third_party/WebKit/Source/modules/presentation/Presentation.h
index 10a940b21938c0aa5ea1f3ac75fb42779be5fa64..5ab715fa229e64454e4514b7907812750a05c3e0 100644
--- a/third_party/WebKit/Source/modules/presentation/Presentation.h
+++ b/third_party/WebKit/Source/modules/presentation/Presentation.h
@@ -17,6 +17,8 @@ class PresentationRequest;
 
 // Implements the main entry point of the Presentation API corresponding to the Presentation.idl
 // See https://w3c.github.io/presentation-api/#navigatorpresentation for details.
+//
+// TODO(Oilpan): switch to GarbageCollected<Presentation> once object is unconditionally on the Oilpan heap.
 class Presentation final
     : public GarbageCollectedFinalized<Presentation>
     , public ScriptWrappable
@@ -25,7 +27,9 @@ class Presentation final
     DEFINE_WRAPPERTYPEINFO();
 public:
     static Presentation* create(LocalFrame*);
+#if !ENABLE(OILPAN)
     ~Presentation() override = default;
+#endif
 
     DECLARE_VIRTUAL_TRACE();