Simplify POSIX font descriptor storage in CFGAS_FontMgr.

Use the existence of a key in the std::map as the indicator of whether a
given element is in the map, rather than the presence of absl::nullopt
values.

Change-Id: Ifc4de90998e2e465ea15ebaf2a93ff0e6b4d7c38
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/87734
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

xfa/fgas/font/cfgas_fontmgr.cpp

diff --git a/xfa/fgas/font/cfgas_fontmgr.cpp b/xfa/fgas/font/cfgas_fontmgr.cpp
index f209e62..1da4dc7 100644
--- a/xfa/fgas/font/cfgas_fontmgr.cpp
+++ b/xfa/fgas/font/cfgas_fontmgr.cpp
@@ -666,11 +666,11 @@
     uint32_t dwHash,
     FX_CodePage wCodePage,
     uint16_t /* wBitField*/) {
-  if (!m_Hash2CandidateList[dwHash].has_value()) {
+  if (!pdfium::Contains(m_Hash2CandidateList, dwHash)) {
     m_Hash2CandidateList[dwHash] =
         MatchFonts(wCodePage, dwFontStyles, pszFontFamily, wUnicode);
   }
-  for (const auto& info : m_Hash2CandidateList[dwHash].value()) {
+  for (const auto& info : m_Hash2CandidateList[dwHash]) {
     CFGAS_FontDescriptor* pDesc = info.pFont;
     if (!VerifyUnicodeForFontDescriptor(pDesc, wUnicode))
       continue;
@@ -806,16 +806,14 @@
   RetainPtr<CFGAS_GEFont> pFont =
       CFGAS_GEFont::LoadFont(pFD->wsFontFace, dwFontStyles, wCodePage);
 #else   // defined(OS_WIN)
-  if (!m_Hash2CandidateList[dwHash].has_value()) {
+  if (!pdfium::Contains(m_Hash2CandidateList, dwHash)) {
     m_Hash2CandidateList[dwHash] =
         MatchFonts(wCodePage, dwFontStyles, WideString(pszFontFamily), 0);
   }
-  std::vector<CFGAS_FontDescriptorInfo>* sortedFontInfos =
-      &m_Hash2CandidateList[dwHash].value();
-  if (sortedFontInfos->empty())
+  if (m_Hash2CandidateList[dwHash].empty())
     return nullptr;
 
-  CFGAS_FontDescriptor* pDesc = (*sortedFontInfos)[0].pFont;
+  CFGAS_FontDescriptor* pDesc = m_Hash2CandidateList[dwHash].front().pFont;
   RetainPtr<CFGAS_GEFont> pFont =
       LoadFontInternal(pDesc->m_wsFaceName, pDesc->m_nFaceIndex);
 #endif  // defined(OS_WIN)

xfa/fgas/font/cfgas_fontmgr.h

diff --git a/xfa/fgas/font/cfgas_fontmgr.h b/xfa/fgas/font/cfgas_fontmgr.h
index 801c974..ec9e972 100644
--- a/xfa/fgas/font/cfgas_fontmgr.h
+++ b/xfa/fgas/font/cfgas_fontmgr.h
@@ -19,7 +19,6 @@
 #include "core/fxcrt/widestring.h"
 #include "core/fxge/cfx_face.h"
 #include "core/fxge/fx_freetype.h"
-#include "third_party/abseil-cpp/absl/types/optional.h"
 
 class CFGAS_GEFont;
 class IFX_SeekableReadStream;
@@ -137,7 +136,7 @@
   std::deque<FX_FONTDESCRIPTOR> m_FontFaces;
 #else
   std::vector<std::unique_ptr<CFGAS_FontDescriptor>> m_InstalledFonts;
-  std::map<uint32_t, absl::optional<std::vector<CFGAS_FontDescriptorInfo>>>
+  std::map<uint32_t, std::vector<CFGAS_FontDescriptorInfo>>
       m_Hash2CandidateList;
 #endif  // defined(OS_WIN)
 };