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

mash/browser/browser.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_BROWSER_BROWSER_H_
-#define MASH_BROWSER_BROWSER_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "mash/public/interfaces/launchable.mojom.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-#include "services/shell/public/cpp/shell_client.h"
-#include "services/tracing/public/cpp/tracing_impl.h"
-
-namespace views {
-class AuraInit;
-class Widget;
-}
-
-namespace mash {
-namespace browser {
-
-class Browser : public shell::ShellClient,
-                public mojom::Launchable,
-                public shell::InterfaceFactory<mojom::Launchable> {
- public:
-  Browser();
-  ~Browser() override;
-
-  // Start/stop tracking individual browser windows. When we no longer track any
-  // browser windows, the application terminates. The Browser object does not
-  // own these widgets.
-  void AddWindow(views::Widget* window);
-  void RemoveWindow(views::Widget* window);
-
- private:
-  // shell::ShellClient:
-  void Initialize(shell::Connector* connector,
-                  const shell::Identity& identity,
-                  uint32_t id) override;
-  bool AcceptConnection(shell::Connection* connection) override;
-
-  // mojom::Launchable:
-  void Launch(uint32_t what, mojom::LaunchMode how) override;
-
-  // shell::InterfaceFactory<mojom::Launchable>:
-  void Create(shell::Connection* connection,
-              mojom::LaunchableRequest request) override;
-
-  shell::Connector* connector_ = nullptr;
-  mojo::BindingSet<mojom::Launchable> bindings_;
-  std::vector<views::Widget*> windows_;
-
-  mojo::TracingImpl tracing_;
-  std::unique_ptr<views::AuraInit> aura_init_;
-
-  DISALLOW_COPY_AND_ASSIGN(Browser);
-};
-
-}  // namespace browser
-}  // namespace mash
-
-#endif  // MASH_BROWSER_BROWSER_H_