Port sky_shell to Linux for testing

sky/shell/service_provider.h

 // Copyright 2015 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 SKY_SHELL_SERVICE_PROVIDER_H_
 #define SKY_SHELL_SERVICE_PROVIDER_H_
 
 #include "base/memory/ref_counted.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/interfaces/application/service_provider.mojom.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace sky {
 namespace shell {
 
 class ServiceProviderContext {
  public:
-  ServiceProviderContext(scoped_refptr<base::SingleThreadTaskRunner> runner)
-      : platform_task_runner(runner.Pass()) {}
+  ServiceProviderContext(scoped_refptr<base::SingleThreadTaskRunner> runner);
+  ~ServiceProviderContext();
 
   scoped_refptr<base::SingleThreadTaskRunner> platform_task_runner;
 };
 
 // Implemented in platform_service_provider.cc for each platform.
 mojo::ServiceProviderPtr CreateServiceProvider(ServiceProviderContext* context);
 
 }  // namespace shell
 }  // namespace sky
 
 #endif  // SKY_SHELL_SERVICE_PROVIDER_H_