Use enum class for subtypes of CPDF_Annot.

fpdfsdk/include/ipdfsdk_annothandler.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 FPDFSDK_INCLUDE_IPDFSDK_ANNOTHANDLER_H_
 #define FPDFSDK_INCLUDE_IPDFSDK_ANNOTHANDLER_H_
 
 #include "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 
-#ifdef PDF_ENABLE_XFA
-#define FSDK_XFAWIDGET_TYPENAME "XFAWidget"
-#endif  // PDF_ENABLE_XFA
-
 class CFX_Matrix;
 class CFX_RenderDevice;
 class CPDF_Annot;
 class CPDFSDK_Annot;
 class CPDFSDK_PageView;
 
 #ifdef PDF_ENABLE_XFA
 class CXFA_FFWidget;
 #endif  // PDF_ENABLE_XFA
 
 class IPDFSDK_AnnotHandler {
  public:
   virtual ~IPDFSDK_AnnotHandler() {}
 
-  virtual CFX_ByteString GetType() = 0;
   virtual FX_BOOL CanAnswer(CPDFSDK_Annot* pAnnot) = 0;
   virtual CPDFSDK_Annot* NewAnnot(CPDF_Annot* pAnnot,
                                   CPDFSDK_PageView* pPage) = 0;
 
 #ifdef PDF_ENABLE_XFA
   virtual CPDFSDK_Annot* NewAnnot(CXFA_FFWidget* hWidget,
                                   CPDFSDK_PageView* pPage) = 0;
 #endif  // PDF_ENABLE_XFA
 
   virtual void ReleaseAnnot(CPDFSDK_Annot* pAnnot) = 0;
@@ skipping 67 matching lines @@
   virtual void OnSelected(CPDFSDK_Annot* pAnnot) = 0;
   virtual FX_BOOL OnSetFocus(CPDFSDK_Annot* pAnnot, uint32_t nFlag) = 0;
   virtual FX_BOOL OnKillFocus(CPDFSDK_Annot* pAnnot, uint32_t nFlag) = 0;
 #ifdef PDF_ENABLE_XFA
   virtual FX_BOOL OnXFAChangedFocus(CPDFSDK_Annot* pOldAnnot,
                                     CPDFSDK_Annot* pNewAnnot) = 0;
 #endif  // PDF_ENABLE_XFA
 };
 
 #endif  // FPDFSDK_INCLUDE_IPDFSDK_ANNOTHANDLER_H_