Remove navigation_service_unittests, along with the service itself.

mash/browser/debug_view.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_DEBUG_VIEW_H_
-#define MASH_BROWSER_DEBUG_VIEW_H_
-
-#include "services/navigation/public/cpp/view.h"
-#include "ui/views/controls/button/button.h"
-#include "ui/views/view.h"
-
-namespace views {
-class Label;
-class LabelButton;
-class Textfield;
-}  // namespace views
-
-namespace mash {
-namespace browser {
-
-// A panel that shows some controls for compelling the content area of the
-// browser to do specific things.
-class DebugView : public views::View,
-                  public views::ButtonListener {
- public:
-  DebugView();
-  ~DebugView() override;
-  DebugView(const DebugView&) = delete;
-  void operator=(const DebugView&) = delete;
-
-  void set_view(navigation::View* view) { view_ = view; }
-
-  gfx::Size GetPreferredSize() const override;
-
- private:
-  void OnPaint(gfx::Canvas* canvas) override;
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
-  navigation::View* view_ = nullptr;
-
-  views::View* interstitial_container_;
-  views::Label* interstitial_label_;
-  views::LabelButton* interstitial_show_;
-  views::LabelButton* interstitial_hide_;
-  views::Textfield* interstitial_content_;
-};
-
-}  // namespace browser
-}  // namespace mash
-
-#endif  // MASH_BROWSER_DEBUG_VIEW_H_