view_manager: Remove PlatformViewport abstraction.

components/view_manager/native_viewport/platform_viewport.h

-// Copyright 2013 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 COMPONENTS_VIEW_MANAGER_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_H_
-#define COMPONENTS_VIEW_MANAGER_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "ui/gfx/geometry/size.h"
-#include "ui/gfx/native_widget_types.h"
-#include "ui/mojo/events/input_events.mojom.h"
-
-namespace gfx {
-class Rect;
-}
-
-namespace native_viewport {
-
-// Encapsulation of platform-specific Viewport.
-class PlatformViewport {
- public:
-  class Delegate {
-   public:
-    virtual ~Delegate() {}
-
-    virtual void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget,
-                                              float device_pixel_ratio) = 0;
-    virtual void OnAcceleratedWidgetDestroyed() = 0;
-    virtual void OnDestroyed() = 0;
-    virtual void OnEvent(mojo::EventPtr event) = 0;
-    virtual void OnMetricsChanged(const gfx::Size& size,
-                                  float device_scale_factor) = 0;
-  };
-
-  virtual ~PlatformViewport() {}
-
-  virtual void Init(const gfx::Rect& bounds) = 0;
-  virtual void Show() = 0;
-  virtual void Hide() = 0;
-  virtual void Close() = 0;
-  virtual gfx::Size GetSize() = 0;
-  virtual void SetBounds(const gfx::Rect& bounds) = 0;
-
-  static scoped_ptr<PlatformViewport> Create(Delegate* delegate, bool headless);
-};
-
-}  // namespace native_viewport
-
-#endif  // COMPONENTS_VIEW_MANAGER_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_H_