More FWL interface cleanup.

xfa/fwl/core/ifwl_widgetmgrdelegate.h

-// Copyright 2016 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#ifndef XFA_FWL_CORE_IFWL_WIDGETMGRDELEGATE_H_
-#define XFA_FWL_CORE_IFWL_WIDGETMGRDELEGATE_H_
-
-#include "core/fxcrt/include/fx_system.h"
-#include "xfa/fwl/core/fwl_error.h"
-
-#define FWL_WGTMGR_DisableThread 0x00000001
-#define FWL_WGTMGR_DisableForm 0x00000002
-
-class CFWL_Message;
-class CFX_Graphics;
-class CFX_Matrix;
-class IFWL_Widget;
-
-class IFWL_WidgetMgrDelegate {
- public:
-  virtual ~IFWL_WidgetMgrDelegate() {}
-
-  virtual FWL_ERR OnSetCapability(
-      uint32_t dwCapability = FWL_WGTMGR_DisableThread) = 0;
-  virtual int32_t OnProcessMessageToForm(CFWL_Message* pMessage) = 0;
-  virtual FWL_ERR OnDrawWidget(IFWL_Widget* pWidget,
-                               CFX_Graphics* pGraphics,
-                               const CFX_Matrix* pMatrix = nullptr) = 0;
-};
-
-#endif  // XFA_FWL_CORE_IFWL_WIDGETMGRDELEGATE_H_