Use enum class for subtypes of CPDF_Annot.

fpdfsdk/include/cpdfsdk_xfawidgethandler.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_CPDFSDK_XFAWIDGETHANDLER_H_
 #define FPDFSDK_INCLUDE_CPDFSDK_XFAWIDGETHANDLER_H_
 
 #include "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "fpdfsdk/include/ipdfsdk_annothandler.h"
 
 class CFX_Matrix;
 class CFX_RenderDevice;
 class CPDF_Annot;
 class CPDFDoc_Environment;
 class CPDFSDK_Annot;
 class CPDFSDK_PageView;
 class CXFA_FFWidget;
 class CXFA_FFWidgetHandler;
 
 class CPDFSDK_XFAWidgetHandler : public IPDFSDK_AnnotHandler {
  public:
   explicit CPDFSDK_XFAWidgetHandler(CPDFDoc_Environment* pApp);
   ~CPDFSDK_XFAWidgetHandler() override;
 
-  CFX_ByteString GetType() override;
   FX_BOOL CanAnswer(CPDFSDK_Annot* pAnnot) override;
   CPDFSDK_Annot* NewAnnot(CPDF_Annot* pAnnot, CPDFSDK_PageView* pPage) override;
   CPDFSDK_Annot* NewAnnot(CXFA_FFWidget* pAnnot,
                           CPDFSDK_PageView* pPage) override;
   void ReleaseAnnot(CPDFSDK_Annot* pAnnot) override;
   void DeleteAnnot(CPDFSDK_Annot* pAnnot) override;
   CFX_FloatRect GetViewBBox(CPDFSDK_PageView* pPageView,
                             CPDFSDK_Annot* pAnnot) override;
   FX_BOOL HitTest(CPDFSDK_PageView* pPageView,
                   CPDFSDK_Annot* pAnnot,
@@ skipping 65 matching lines @@
                             CPDFSDK_Annot* pNewAnnot) override;
 
  private:
   CXFA_FFWidgetHandler* GetXFAWidgetHandler(CPDFSDK_Annot* pAnnot);
   uint32_t GetFWLFlags(uint32_t dwFlag);
 
   CPDFDoc_Environment* m_pApp;
 };
 
 #endif  // FPDFSDK_INCLUDE_CPDFSDK_XFAWIDGETHANDLER_H_