[Extensions Bindings] Add ExtensionBindingsSystem interface; hook it up

extensions/renderer/service_worker_data.h

 // Copyright 2016 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 EXTENSIONS_BROWSER_SERVICE_WORKER_DATA_H_
 #define EXTENSIONS_BROWSER_SERVICE_WORKER_DATA_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "extensions/renderer/service_worker_request_sender.h"
 #include "extensions/renderer/v8_schema_registry.h"
 
 namespace extensions {
-class WorkerThreadDispatcher;
+class ExtensionBindingsSystem;
 
 // Per ServiceWorker data in worker thread.
 // Contains: RequestSender, V8SchemaRegistry.
 // TODO(lazyboy): Also put worker ScriptContexts in this.
 class ServiceWorkerData {
  public:
-  ServiceWorkerData(WorkerThreadDispatcher* dispatcher,
-                    int64_t service_worker_version_id);
+  ServiceWorkerData(int64_t service_worker_version_id,
+                    std::unique_ptr<ExtensionBindingsSystem> bindings_system);
   ~ServiceWorkerData();
 
   V8SchemaRegistry* v8_schema_registry() { return v8_schema_registry_.get(); }
-  ServiceWorkerRequestSender* request_sender() { return request_sender_.get(); }
+  ExtensionBindingsSystem* bindings_system() { return bindings_system_.get(); }
   int64_t service_worker_version_id() const {
     return service_worker_version_id_;
   }
 
  private:
   const int64_t service_worker_version_id_;
 
   std::unique_ptr<V8SchemaRegistry> v8_schema_registry_;
-  std::unique_ptr<ServiceWorkerRequestSender> request_sender_;
+  std::unique_ptr<ExtensionBindingsSystem> bindings_system_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerData);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_SERVICE_WORKER_DATA_H_