Remove unused in-process pepper APIs

ppapi/thunk/ppb_widget_api.h

-// Copyright (c) 2011 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_THUNK_PPB_WIDGET_API_H_
-#define PPAPI_THUNK_PPB_WIDGET_API_H_
-
-#include "ppapi/c/dev/ppb_widget_dev.h"
-
-namespace ppapi {
-namespace thunk {
-
-class PPB_Widget_API {
- public:
-  virtual ~PPB_Widget_API() {}
-
-  virtual PP_Bool Paint(const PP_Rect* rect, PP_Resource image_id) = 0;
-  virtual PP_Bool HandleEvent(PP_Resource pp_input_event) = 0;
-  virtual PP_Bool GetLocation(PP_Rect* location) = 0;
-  virtual void SetLocation(const PP_Rect* location) = 0;
-  virtual void SetScale(float scale) = 0;
-};
-
-}  // namespace thunk
-}  // namespace ppapi
-
-#endif  // PPAPI_THUNK_PPB_WIDGET_API_H_