Drop (empty) virtual destructor from Iterable<> class

Source/modules/fetch/Headers.h

Index: Source/modules/fetch/Headers.h
diff --git a/Source/modules/fetch/Headers.h b/Source/modules/fetch/Headers.h
index 10cad823e622ecd3c148a26928b712f4655be897..c9d5c426951f6cdb2401e386b493ecb6f2d889c2 100644
--- a/Source/modules/fetch/Headers.h
+++ b/Source/modules/fetch/Headers.h
@@ -19,7 +19,7 @@ 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 };