Remove include only fwl.h and IWYU.

xfa/include/fwl/adapter/fwl_adapterwidgetmgr.h

 // Copyright 2014 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_INCLUDE_FWL_ADAPTER_FWL_ADAPTERWIDGETMGR_H_
 #define XFA_INCLUDE_FWL_ADAPTER_FWL_ADAPTERWIDGETMGR_H_
 
+#include "core/include/fxcrt/fx_coordinates.h"
+#include "core/include/fxcrt/fx_system.h"
+#include "xfa/include/fwl/core/fwl_error.h"
+
 class IFWL_Widget;
 class IFWL_Menu;
 class IFWL_MenuDP;
 class CFX_Path;
 class CFX_DIBitmap;
 class IFWL_AdapterMessageHook;
 class IFWL_AppDelegate;
 
 class IFWL_AdapterWidgetMgr {
  public:
@@ skipping 49 matching lines @@
                                   FX_FLOAT& r,
                                   FX_FLOAT& b) = 0;
   virtual FX_BOOL GetPopupPos(IFWL_Widget* pWidget,
                               FX_FLOAT fMinHeight,
                               FX_FLOAT fMaxHeight,
                               const CFX_RectF& rtAnchor,
                               CFX_RectF& rtPopup) = 0;
 };
 
 #endif  // XFA_INCLUDE_FWL_ADAPTER_FWL_ADAPTERWIDGETMGR_H_