Remove navigation_service_unittests, along with the service itself.

services/navigation/public/cpp/view_delegate.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_PUBLIC_CPP_VIEW_DELEGATE_H_
-#define SERVICES_NAVIGATION_PUBLIC_CPP_VIEW_DELEGATE_H_
-
-#include <memory>
-
-namespace gfx {
-class Rect;
-}
-
-namespace navigation {
-
-class View;
-
-class ViewDelegate {
- public:
-  // Called when an action within the page has caused a new View to be created.
-  // The delegate must take action to either create a new host for this View, or
-  // close it.
-  // |source| is the View originating the request.
-  // |new_view| is the newly created View.
-  // |is_popup| is true if the View should be shown in a popup window instead of
-  // a new tab.
-  // |requested_bounds| are the requested bounds of the new popup.
-  // |user_gesture| is true if the View was created as the result of an explicit
-  // user input event.
-  virtual void ViewCreated(View* source,
-                           std::unique_ptr<View> new_view,
-                           bool is_popup,
-                           const gfx::Rect& requested_bounds,
-                           bool user_gesture) = 0;
-
-  // Called when an action within the page has requested that the View be
-  // closed.
-  virtual void Close(View* source) = 0;
-
-  // Called when the application in the source view wants the delegate to
-  // navigate the view according to |params|.
-  virtual void OpenURL(View* source, mojom::OpenURLParamsPtr params) = 0;
-};
-
-}  // namespace navigation
-
-#endif  // SERVICES_NAVIGATION_PUBLIC_CPP_VIEW_DELEGATE_H_