Removing EagerSweeping from GlobalCacheStorageImpl

Eager sweeping was added to dispose of CachesStorage.
CachesStoreage is a member, so eager sweeping didn't do anything.

Bug: 981043
Change-Id: I418dabf6596188660d10b91fefddf80c9dd8dae4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692984Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675718}

third_party/blink/renderer/modules/cache_storage/global_cache_storage.cc

@@ -74,8 +74,6 @@ class GlobalCacheStorageImpl final
     return caches_;
   }
 
-  // Promptly dispose of associated CacheStorage.
-  EAGERLY_FINALIZE();
   void Trace(blink::Visitor* visitor) override {
     visitor->Trace(caches_);
     Supplement<T>::Trace(visitor);