Add a basic browser to mash that uses the navigation service.

services/navigation/navigation.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 SERVICES_NAVIGATION_NAVIGATION_H_
 #define SERVICES_NAVIGATION_NAVIGATION_H_
 
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/navigation/public/interfaces/view.mojom.h"
 #include "services/shell/public/cpp/interface_factory.h"
 #include "services/shell/public/cpp/shell_client.h"
 #include "services/shell/public/cpp/shell_connection_ref.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace navigation {
 
 class Navigation : public shell::ShellClient,
                    public shell::InterfaceFactory<mojom::ViewFactory>,
                    public mojom::ViewFactory {
  public:
   Navigation();
   ~Navigation() override;
 
-  void SetBrowserContext(content::BrowserContext* browser_context);
+  void Init(shell::Connector* connector,
+            content::BrowserContext* browser_context);
 
  private:
   // shell::ShellClient:
   bool AcceptConnection(shell::Connection* connection) override;
 
   // shell::InterfaceFactory<mojom::ViewFactory>:
   void Create(shell::Connection* connection,
               mojom::ViewFactoryRequest request) override;
 
   // mojom::ViewFactory:
   void CreateView(mojom::ViewClientPtr client,
                   mojom::ViewRequest request) override;
 
   void ViewFactoryLost();
 
+  shell::Connector* connector_ = nullptr;
   shell::ShellConnectionRefFactory ref_factory_;
   std::set<std::unique_ptr<shell::ShellConnectionRef>> refs_;
   content::BrowserContext* browser_context_ = nullptr;
   mojo::BindingSet<mojom::ViewFactory> bindings_;
   std::vector<std::pair<mojom::ViewClientPtr, mojom::ViewRequest>>
       pending_creates_;
 
   DISALLOW_COPY_AND_ASSIGN(Navigation);
 };
 
 }  // navigation
 
 #endif  // SERVICES_NAVIGATION_NAVIGATION_H_