Merge the CFWL_*Imp classes into the IFWL_* classes.

xfa/fwl/core/ifwl_combolist.h

Index: xfa/fwl/core/ifwl_combolist.h
diff --git a/xfa/fwl/core/ifwl_combolist.h b/xfa/fwl/core/ifwl_combolist.h
new file mode 100644
index 0000000000000000000000000000000000000000..74e79cd805399394c697e9f233648f0697625c45
--- /dev/null
+++ b/xfa/fwl/core/ifwl_combolist.h
@@ -0,0 +1,54 @@
+// 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_FWL_CORE_IFWL_COMBOLIST_H_
+#define XFA_FWL_CORE_IFWL_COMBOLIST_H_
+
+#include "xfa/fwl/core/cfwl_widgetimpproperties.h"
+#include "xfa/fwl/core/ifwl_listbox.h"
+#include "xfa/fwl/core/ifwl_widget.h"
+
+class IFWL_ComboList : public IFWL_ListBox {
+ public:
+  static IFWL_ComboList* Create(const CFWL_WidgetImpProperties& properties,
+                                IFWL_Widget* pOuter);
+
+  IFWL_ComboList(const CFWL_WidgetImpProperties& properties,
+                 IFWL_Widget* pOuter);
+
+  // IFWL_Widget
+  FWL_Error Initialize() override;
+  FWL_Error Finalize() override;
+
+  int32_t MatchItem(const CFX_WideString& wsMatch);
+  void ChangeSelected(int32_t iSel);
+  int32_t CountItems();
+  void GetItemRect(int32_t nIndex, CFX_RectF& rtItem);
+  void ClientToOuter(FX_FLOAT& fx, FX_FLOAT& fy);
+  void SetFocus(FX_BOOL bSet);
+
+  FX_BOOL m_bNotifyOwner;
+
+  friend class CFWL_ComboListImpDelegate;
+  friend class IFWL_ComboBox;
+};
+
+class CFWL_ComboListImpDelegate : public CFWL_ListBoxImpDelegate {
+ public:
+  CFWL_ComboListImpDelegate(IFWL_ComboList* pOwner);
+  void OnProcessMessage(CFWL_Message* pMessage) override;
+
+ protected:
+  void OnDropListFocusChanged(CFWL_Message* pMsg, FX_BOOL bSet = TRUE);
+  int32_t OnDropListMouseMove(CFWL_MsgMouse* pMsg);
+  int32_t OnDropListLButtonDown(CFWL_MsgMouse* pMsg);
+  int32_t OnDropListLButtonUp(CFWL_MsgMouse* pMsg);
+  int32_t OnDropListKey(CFWL_MsgKey* pKey);
+  void OnDropListKeyDown(CFWL_MsgKey* pKey);
+  IFWL_ComboList* m_pOwner;
+};
+
+#endif  // XFA_FWL_CORE_IFWL_COMBOLIST_H_