[cast_channel] Make CastSocket not inherit from ApiResource

extensions/browser/api/cast_channel/cast_socket_service_factory.h

+// Copyright 2017 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_API_CAST_CHANNEL_CAST_CHANNEL_SERVICE_FACTORY_H_
+#define EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_CHANNEL_SERVICE_FACTORY_H_
+
+#include "base/lazy_instance.h"
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace extensions {
+namespace api {
+namespace cast_channel {
+
+class CastSocketService;
+
+// TODO(crbug.com/725717): CastSocket created by one profile (browser context)
+// could be shared with other profiles.
+class CastSocketServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  // Caller needs to make sure that it passes in the same |context| instance to
+  // this function for both normal profile and incognito profile.
+  static CastSocketService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  static CastSocketServiceFactory* GetInstance();
+
+ private:
+  friend struct base::LazyInstanceTraitsBase<CastSocketServiceFactory>;
+
+  CastSocketServiceFactory();
+  ~CastSocketServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory interface.
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(CastSocketServiceFactory);
+};
+
+}  // namespace cast_channel
+}  // namespace api
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_CHANNEL_SERVICE_FACTORY_H_