Patch on top of https://codereview.chromium.org/474593002

content/renderer/service_worker/service_worker_cache_storage_dispatcher.h

Index: content/renderer/service_worker/service_worker_cache_storage_dispatcher.h
diff --git a/content/renderer/service_worker/service_worker_cache_storage_dispatcher.h b/content/renderer/service_worker/service_worker_cache_storage_dispatcher.h
index ccc0cc7bc7f0a73bee6e414dd05327d7ef836b10..3c10205b832c9232e5e97fe76c3b9f2823121241 100644
--- a/content/renderer/service_worker/service_worker_cache_storage_dispatcher.h
+++ b/content/renderer/service_worker/service_worker_cache_storage_dispatcher.h
@@ -127,6 +127,7 @@ class ServiceWorkerCacheStorageDispatcher
                 IDMapOwnPointer> WithResponsesCallbacksMap;
   typedef IDMap<blink::WebServiceWorkerCache::CacheWithRequestsCallbacks,
                 IDMapOwnPointer> WithRequestsCallbacksMap;
+  typedef IDMap<WebCache, IDMapExternalPointer> WebCacheMap;
 
   // Not owned. The script context containing this object.
   ServiceWorkerScriptContext* script_context_;
@@ -138,7 +139,7 @@ class ServiceWorkerCacheStorageDispatcher
   KeysCallbacksMap keys_callbacks_;
 
   // The individual caches created under this CacheStorage object.
-  IDMap<WebCache, IDMapExternalPointer> web_caches_;
+  WebCacheMap web_caches_;
 
   // These ID maps are held in the CacheStorage object rather than the Cache
   // object to ensure that the IDs are unique.