Introduce WebServiceWorkerNetworkProvider::GetProviderID() and stop static casting

content/child/service_worker/service_worker_network_provider.cc

 // 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.
 
 #include "content/child/service_worker/service_worker_network_provider.h"
 
 #include "base/atomic_sequence_num.h"
 #include "content/child/child_thread_impl.h"
 #include "content/child/request_extra_data.h"
 #include "content/child/service_worker/service_worker_handle_reference.h"
@@ skipping 62 matching lines @@
             blink::WebURLRequest::ServiceWorkerMode::kNone) {
       request.SetServiceWorkerMode(
           blink::WebURLRequest::ServiceWorkerMode::kForeign);
     }
   }
 
   bool IsControlledByServiceWorker() override {
     return provider_->IsControlledByServiceWorker();
   }
 
+  int GetProviderID() const override { return provider_->provider_id(); }
+
   int64_t ServiceWorkerID() override {
     if (provider_->context() && provider_->context()->controller())
       return provider_->context()->controller()->version_id();
     return kInvalidServiceWorkerVersionId;
   }
 
   ServiceWorkerNetworkProvider* provider() { return provider_.get(); }
 
  private:
   std::unique_ptr<ServiceWorkerNetworkProvider> provider_;
@@ skipping 119 matching lines @@
     return;  // May be null in some tests.
   dispatcher_host_->OnSetHostedVersionId(provider_id(), version_id,
                                          embedded_worker_id);
 }
 
 bool ServiceWorkerNetworkProvider::IsControlledByServiceWorker() const {
   return context() && context()->controller();
 }
 
 }  // namespace content