Revert "Create ServiceWorkerProviderHost before starting worker"

content/browser/service_worker/service_worker_version.h

 // Copyright 2013 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 280 matching lines @@
   // Adds and removes |provider_host| as a controllee of this ServiceWorker.
   void AddControllee(ServiceWorkerProviderHost* provider_host);
   void RemoveControllee(ServiceWorkerProviderHost* provider_host);
 
   // Returns if it has controllee.
   bool HasControllee() const { return !controllee_map_.empty(); }
   std::map<std::string, ServiceWorkerProviderHost*> controllee_map() {
     return controllee_map_;
   }
 
-  // The provider host hosting this version. Only valid while the version is
-  // running.
-  ServiceWorkerProviderHost* provider_host() {
-    DCHECK(provider_host_);
-    return provider_host_.get();
-  }
-
   base::WeakPtr<ServiceWorkerContextCore> context() const { return context_; }
 
   // Adds and removes |request_job| as a dependent job not to stop the
   // ServiceWorker while |request_job| is reading the stream of the fetch event
   // response from the ServiceWorker.
   void AddStreamingURLRequestJob(const ServiceWorkerURLRequestJob* request_job);
   void RemoveStreamingURLRequestJob(
       const ServiceWorkerURLRequestJob* request_job);
 
   // Adds and removes Listeners.
@@ skipping 393 matching lines @@
   // Container for pending external requests for this service worker.
   // (key, value): (request uuid, request id).
   using RequestUUIDToRequestIDMap = std::map<std::string, int>;
   RequestUUIDToRequestIDMap external_request_uuid_to_request_id_;
 
   // Connected to ServiceWorkerContextClient while the worker is running.
   mojom::ServiceWorkerEventDispatcherPtr event_dispatcher_;
 
   std::set<const ServiceWorkerURLRequestJob*> streaming_url_request_jobs_;
 
-  // Keeps track of the provider hosting this running service worker for this
-  // version. |provider_host_| is always valid as long as this version is
-  // running.
-  base::WeakPtr<ServiceWorkerProviderHost> provider_host_;
-
   std::map<std::string, ServiceWorkerProviderHost*> controllee_map_;
   // Will be null while shutting down.
   base::WeakPtr<ServiceWorkerContextCore> context_;
   base::ObserverList<Listener> listeners_;
   ServiceWorkerScriptCacheMap script_cache_map_;
   base::OneShotTimer update_timer_;
 
   // Starts running in StartWorker and continues until the worker is stopped.
   base::RepeatingTimer timeout_timer_;
   // Holds the time the worker last started being considered idle.
@@ skipping 92 matching lines @@
 
   // At this point |this| can have been deleted, so don't do anything other
   // than returning.
 
   return true;
 }
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_