Presentation API: Blink changes to allow getAvailability() to be rejected.

Source/modules/presentation/PresentationError.h

Index: Source/modules/presentation/PresentationError.h
diff --git a/Source/modules/presentation/PresentationError.h b/Source/modules/presentation/PresentationError.h
index 9469dc13d973bd698f11a291d260f55f65f37e6f..3fa29cee31cf1f31773ee6bdc40602da215723bf 100644
--- a/Source/modules/presentation/PresentationError.h
+++ b/Source/modules/presentation/PresentationError.h
@@ -16,10 +16,10 @@ class DOMException;
 class PresentationError final {
     WTF_MAKE_NONCOPYABLE(PresentationError);
 public:
-    static DOMException* take(WebPresentationError*);
-    static void dispose(WebPresentationError*);
+    static DOMException* take(const WebPresentationError&);
 
 private:
+    PresentationError() = delete;
     ~PresentationError() = delete;
 };