Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/devtools_service/devtools_service.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 COMPONENTS_DEVTOOLS_SERVICE_DEVTOOLS_SERVICE_H_
 #define COMPONENTS_DEVTOOLS_SERVICE_DEVTOOLS_SERVICE_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/devtools_service/devtools_registry_impl.h"
 #include "components/devtools_service/public/interfaces/devtools_service.mojom.h"
 #include "mojo/common/weak_binding_set.h"
 
 namespace mojo {
-class ApplicationImpl;
+class Shell;
 }
 
 namespace devtools_service {
 
 class DevToolsHttpServer;
 
 // DevToolsService is the central control. It manages the communication with
 // DevTools agents (e.g., Web page renderers). It also starts an HTTP server to
 // speak the Chrome remote debugging protocol.
 class DevToolsService : public DevToolsCoordinator {
  public:
   // Doesn't take ownership of |application|, which must outlive this object.
-  explicit DevToolsService(mojo::ApplicationImpl* application);
+  explicit DevToolsService(mojo::Shell* shell);
   ~DevToolsService() override;
 
   void BindToCoordinatorRequest(
       mojo::InterfaceRequest<DevToolsCoordinator> request);
 
-  mojo::ApplicationImpl* application() { return application_; }
+  mojo::Shell* shell() { return shell_; }
 
   DevToolsRegistryImpl* registry() { return &registry_; }
 
  private:
   // DevToolsCoordinator implementation.
   void Initialize(uint16_t remote_debugging_port) override;
 
   // Not owned by this object.
-  mojo::ApplicationImpl* const application_;
+  mojo::Shell* const shell_;
 
   mojo::WeakBindingSet<DevToolsCoordinator> coordinator_bindings_;
 
   scoped_ptr<DevToolsHttpServer> http_server_;
   DevToolsRegistryImpl registry_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsService);
 };
 
 }  // namespace devtools_service
 
 #endif  // COMPONENTS_DEVTOOLS_SERVICE_DEVTOOLS_SERVICE_H_