Use enum class for subtypes of CPDF_Annot.

fpdfsdk/cpdfsdk_baannothandler.cpp

 // 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
 
 #include "fpdfsdk/include/cpdfsdk_baannothandler.h"
 
 #include <memory>
 #include <vector>
@@ skipping 19 matching lines @@
     rects.push_back(pPopupAnnot->GetRect());
   pPageView->UpdateRects(rects);
 }
 
 }  // namespace
 
 CPDFSDK_BAAnnotHandler::CPDFSDK_BAAnnotHandler() {}
 
 CPDFSDK_BAAnnotHandler::~CPDFSDK_BAAnnotHandler() {}
 
-CFX_ByteString CPDFSDK_BAAnnotHandler::GetType() {
-  return CFX_ByteString("");
-}
-
 FX_BOOL CPDFSDK_BAAnnotHandler::CanAnswer(CPDFSDK_Annot* pAnnot) {
   return FALSE;
 }
 
 CPDFSDK_Annot* CPDFSDK_BAAnnotHandler::NewAnnot(CPDF_Annot* pAnnot,
                                                 CPDFSDK_PageView* pPage) {
   return new CPDFSDK_BAAnnot(pAnnot, pPage);
 }
 
 #ifdef PDF_ENABLE_XFA
@@ skipping 156 matching lines @@
 
 FX_BOOL CPDFSDK_BAAnnotHandler::HitTest(CPDFSDK_PageView* pPageView,
                                         CPDFSDK_Annot* pAnnot,
                                         const CFX_FloatPoint& point) {
   ASSERT(pPageView);
   ASSERT(pAnnot);
 
   CFX_FloatRect rect = GetViewBBox(pPageView, pAnnot);
   return rect.Contains(point.x, point.y);
 }