Make Service own ServiceContext.

mash/screenlock/screenlock.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 MASH_SCREENLOCK_SCREENLOCK_H_
 #define MASH_SCREENLOCK_SCREENLOCK_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 12 matching lines @@
 namespace screenlock {
 
 class Screenlock : public shell::Service,
                    public session::mojom::ScreenlockStateListener {
  public:
   Screenlock();
   ~Screenlock() override;
 
  private:
   // shell::Service:
-  void OnStart(shell::Connector* connector,
-               const shell::Identity& identity,
-               uint32_t id) override;
+  void OnStart(const shell::Identity& identity) override;
 
   // session::mojom::ScreenlockStateListener:
   void ScreenlockStateChanged(bool locked) override;
 
   mojo::TracingImpl tracing_;
   std::unique_ptr<views::AuraInit> aura_init_;
   std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
   mojo::BindingSet<session::mojom::ScreenlockStateListener> bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(Screenlock);
 };
 
 }  // namespace screenlock
 }  // namespace mash
 
 #endif  // MASH_SCREENLOCK_SCREENLOCK_H_