CallbackPromiseAdapter types should be more compatible with WebCallbacks (3/3).

Source/modules/push_messaging/PushError.h

Index: Source/modules/push_messaging/PushError.h
diff --git a/Source/modules/push_messaging/PushError.h b/Source/modules/push_messaging/PushError.h
index ee59bb9d732d6226725df3049ad87c1e8e52c9ad..ed38bb1126cfb34f90d1af5e729f8168d06a8e8e 100644
--- a/Source/modules/push_messaging/PushError.h
+++ b/Source/modules/push_messaging/PushError.h
@@ -8,8 +8,6 @@
 #include "core/dom/DOMException.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/push_messaging/WebPushError.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
@@ -19,8 +17,8 @@ class PushError {
     WTF_MAKE_NONCOPYABLE(PushError);
 public:
     // For CallbackPromiseAdapter.
-    using WebType = OwnPtr<WebPushError>;
-    static DOMException* take(ScriptPromiseResolver*, PassOwnPtr<WebPushError> webError);
+    using WebType = const WebPushError&;
+    static DOMException* take(ScriptPromiseResolver*, const WebPushError& webError);
 
 private:
     PushError() = delete;