Cleanup some PWL interfaces.

fpdfsdk/pdfwindow/PWL_Wnd.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 FPDFSDK_PDFWINDOW_PWL_WND_H_
 #define FPDFSDK_PDFWINDOW_PWL_WND_H_
 
 #include <vector>
@@ skipping 164 matching lines @@
   5 L"&Delete"
   6  L"&Select All\tCtrl+A"
   */
   virtual CFX_WideString LoadPopupMenuString(int32_t nIndex) = 0;
 };
 
 class IPWL_FocusHandler {
  public:
   virtual ~IPWL_FocusHandler() {}
   virtual void OnSetFocus(CPWL_Wnd* pWnd) = 0;
-  virtual void OnKillFocus(CPWL_Wnd* pWnd) = 0;
 };
 
 struct PWL_CREATEPARAM {
  public:
   PWL_CREATEPARAM();
   PWL_CREATEPARAM(const PWL_CREATEPARAM& other);
 
   CFX_FloatRect rcRectWnd;            // required
   CFX_SystemHandler* pSystemHandler;  // required
   IPVT_FontMap* pFontMap;             // required for text window
@@ skipping 227 matching lines @@
   CFX_FloatRect m_rcWindow;
   CFX_FloatRect m_rcClip;
 
   FX_BOOL m_bCreated;
   FX_BOOL m_bVisible;
   FX_BOOL m_bNotifying;
   FX_BOOL m_bEnabled;
 };
 
 #endif  // FPDFSDK_PDFWINDOW_PWL_WND_H_