Remove navigation_service_unittests, along with the service itself.

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 "base/memory/ref_counted.h"
-#include "base/sequenced_task_runner.h"
-#include "content/public/common/connection_filter.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-#include "services/navigation/public/interfaces/view.mojom.h"
-#include "services/service_manager/public/cpp/binder_registry.h"
-#include "services/service_manager/public/cpp/service.h"
-#include "services/service_manager/public/cpp/service_context_ref.h"
-
-namespace navigation {
-
-std::unique_ptr<service_manager::Service> CreateNavigationService();
-
-class Navigation : public service_manager::Service, public mojom::ViewFactory {
- public:
-  Navigation();
-  ~Navigation() override;
-
- private:
-  // service_manager::Service:
-  void OnBindInterface(const service_manager::BindSourceInfo& source_info,
-                       const std::string& interface_name,
-                       mojo::ScopedMessagePipeHandle interface_pipe) override;
-
-  // mojom::ViewFactory:
-  void CreateView(mojom::ViewClientPtr client,
-                  mojom::ViewRequest request) override;
-
-  void BindViewFactoryRequest(
-      const service_manager::BindSourceInfo& source_info,
-      mojom::ViewFactoryRequest request);
-
-  void ViewFactoryLost();
-
-  scoped_refptr<base::SequencedTaskRunner> view_task_runner_;
-
-  std::string client_user_id_;
-
-  service_manager::ServiceContextRefFactory ref_factory_;
-  std::set<std::unique_ptr<service_manager::ServiceContextRef>> refs_;
-
-  service_manager::BinderRegistry registry_;
-  mojo::BindingSet<mojom::ViewFactory> bindings_;
-
-  DISALLOW_COPY_AND_ASSIGN(Navigation);
-};
-
-}  // navigation
-
-#endif  // SERVICES_NAVIGATION_NAVIGATION_H_