[cast_channel] Move cast_channel related files from //extensions to //components

extensions/browser/api/cast_channel/cast_socket_service_factory.cc

-// 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.
-
-#include "extensions/browser/api/cast_channel/cast_socket_service_factory.h"
-
-#include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "extensions/browser/api/cast_channel/cast_socket_service.h"
-
-namespace extensions {
-namespace api {
-namespace cast_channel {
-
-using content::BrowserContext;
-
-namespace {
-
-base::LazyInstance<CastSocketServiceFactory>::DestructorAtExit service_factory =
-    LAZY_INSTANCE_INITIALIZER;
-}  // namespace
-
-// static
-CastSocketService* CastSocketServiceFactory::GetForBrowserContext(
-    BrowserContext* context) {
-  DCHECK(context);
-  // GetServiceForBrowserContext returns a KeyedService hence the static_cast<>
-  // to return a pointer to CastSocketService.
-  return static_cast<CastSocketService*>(
-      service_factory.Get().GetServiceForBrowserContext(context, true));
-}
-
-// static
-CastSocketServiceFactory* CastSocketServiceFactory::GetInstance() {
-  return &service_factory.Get();
-}
-
-CastSocketServiceFactory::CastSocketServiceFactory()
-    : BrowserContextKeyedServiceFactory(
-          "CastSocketService",
-          BrowserContextDependencyManager::GetInstance()) {}
-
-CastSocketServiceFactory::~CastSocketServiceFactory() {}
-
-content::BrowserContext* CastSocketServiceFactory::GetBrowserContextToUse(
-    content::BrowserContext* context) const {
-  return context;
-}
-
-KeyedService* CastSocketServiceFactory::BuildServiceInstanceFor(
-    BrowserContext* context) const {
-  return new CastSocketService();
-}
-
-}  // namespace cast_channel
-}  // namespace api
-}  // namespace extensions