Promptly finalize CacheStorage's embedder object.

Source/modules/cachestorage/CacheStorage.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 CacheStorage_h
 #define CacheStorage_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/cachestorage/Cache.h"
 #include "modules/cachestorage/CacheQueryOptions.h"
 #include "modules/fetch/GlobalFetch.h"
 #include "public/platform/WebServiceWorkerCacheStorage.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class Cache;
 class WebServiceWorkerCacheStorage;
 
 class CacheStorage final : public GarbageCollectedFinalized<CacheStorage>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_NONCOPYABLE(CacheStorage);
 public:
     static CacheStorage* create(WeakPtr<GlobalFetch::ScopedFetcher>, WebServiceWorkerCacheStorage*);
+    ~CacheStorage();
+    void dispose();
 
     ScriptPromise open(ScriptState*, const String& cacheName);
     ScriptPromise has(ScriptState*, const String& cacheName);
     ScriptPromise deleteFunction(ScriptState*, const String& cacheName);
     ScriptPromise keys(ScriptState*);
     ScriptPromise match(ScriptState*, const RequestInfo&, const CacheQueryOptions&, ExceptionState&);
 
-
     DECLARE_TRACE();
 
 private:
     class Callbacks;
     class WithCacheCallbacks;
     class DeleteCallbacks;
     class KeysCallbacks;
     class MatchCallbacks;
 
     friend class WithCacheCallbacks;
     friend class DeleteCallbacks;
 
     CacheStorage(WeakPtr<GlobalFetch::ScopedFetcher>, PassOwnPtr<WebServiceWorkerCacheStorage>);
     ScriptPromise matchImpl(ScriptState*, const Request*, const CacheQueryOptions&);
 
     WeakPtr<GlobalFetch::ScopedFetcher> m_scopedFetcher;
     OwnPtr<WebServiceWorkerCacheStorage> m_webCacheStorage;
     HeapHashMap<String, Member<Cache>> m_nameToCacheMap;
 };
 
 } // namespace blink
 
 #endif // CacheStorage_h