Make ActiveScriptWrappable the GC mixin it is.

third_party/WebKit/Source/modules/fetch/Request.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Request_h
 #define Request_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
@@ skipping 13 matching lines @@
 class EncodedFormData;
 class RequestInit;
 class WebServiceWorkerRequest;
 
 using RequestInfo = RequestOrUSVString;
 
 class MODULES_EXPORT Request final : public Body {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_NONCOPYABLE(Request);
 public:
-    ~Request() override {}
-
     // From Request.idl:
     static Request* create(ScriptState*, const RequestInfo&, const Dictionary&, ExceptionState&);
 
     static Request* create(ScriptState*, const String&, ExceptionState&);
     static Request* create(ScriptState*, const String&, const Dictionary&, ExceptionState&);
     static Request* create(ScriptState*, Request*, ExceptionState&);
     static Request* create(ScriptState*, Request*, const Dictionary&, ExceptionState&);
     static Request* create(ScriptState*, FetchRequestData*);
     static Request* create(ScriptState*, const WebServiceWorkerRequest&);
 
@@ skipping 31 matching lines @@
 
     String mimeType() const override;
 
     const Member<FetchRequestData> m_request;
     const Member<Headers> m_headers;
 };
 
 } // namespace blink
 
 #endif // Request_h