Drop (empty) virtual destructor from Iterable<> class

Source/modules/fetch/Headers.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 Headers_h
 #define Headers_h
 
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/Iterable.h"
 #include "modules/fetch/FetchHeaderList.h"
 #include "wtf/Forward.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class Dictionary;
 class ExceptionState;
 class Iterator;
 
 // http://fetch.spec.whatwg.org/#headers-class
-class Headers final : public GarbageCollectedFinalized<Headers>, public ScriptWrappable, public PairIterable<String, String> {
+class Headers final : public GarbageCollected<Headers>, public ScriptWrappable, public PairIterable<String, String> {
     DEFINE_WRAPPERTYPEINFO();
 public:
     enum Guard { ImmutableGuard, RequestGuard, RequestNoCORSGuard, ResponseGuard, NoneGuard };
 
     static Headers* create();
     static Headers* create(ExceptionState&);
     static Headers* create(const Headers*, ExceptionState&);
     static Headers* create(const Vector<Vector<String> >&, ExceptionState&);
     static Headers* create(const Dictionary&, ExceptionState&);
 
@@ skipping 28 matching lines @@
 
     Member<FetchHeaderList> m_headerList;
     Guard m_guard;
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // Headers_h