Remove unused in-process pepper APIs

ppapi/cpp/dev/widget_client_dev.h

-// Copyright (c) 2010 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 PPAPI_CPP_DEV_WIDGET_CLIENT_DEV_H_
-#define PPAPI_CPP_DEV_WIDGET_CLIENT_DEV_H_
-
-#include "ppapi/c/pp_stdint.h"
-#include "ppapi/cpp/instance_handle.h"
-
-namespace pp {
-
-class Instance;
-class Rect;
-class Scrollbar_Dev;
-class Widget_Dev;
-
-// This class provides a C++ interface for callbacks related to widgets. You
-// would normally use multiple inheritance to derive from this class in your
-// instance.
-class WidgetClient_Dev {
- public:
-  explicit WidgetClient_Dev(Instance* instance);
-  virtual ~WidgetClient_Dev();
-
-  /**
-   * Notification that the given widget should be repainted. This is the
-   * implementation for PPP_Widget_Dev.
-   */
-  virtual void InvalidateWidget(Widget_Dev widget, const Rect& dirty_rect) = 0;
-
-  /**
-   * Notification that the given scrollbar should change value. This is the
-   * implementation for PPP_Scrollbar_Dev.
-   */
-  virtual void ScrollbarValueChanged(Scrollbar_Dev scrollbar,
-                                     uint32_t value) = 0;
-
-  /**
-   * Notification that the given scrollbar's overlay type has changed. This is
-   * the implementation for PPP_Scrollbar_Dev.
-   */
-  virtual void ScrollbarOverlayChanged(Scrollbar_Dev scrollbar,
-                                       bool type) = 0;
-
- private:
-  InstanceHandle associated_instance_;
-};
-
-}  // namespace pp
-
-#endif  // PPAPI_CPP_DEV_WIDGET_CLIENT_DEV_H_