Cleanup some PWL_FontMap methods

fpdfsdk/pdfwindow/PWL_FontMap.cpp

Index: fpdfsdk/pdfwindow/PWL_FontMap.cpp
diff --git a/fpdfsdk/pdfwindow/PWL_FontMap.cpp b/fpdfsdk/pdfwindow/PWL_FontMap.cpp
index 96acb78ec2aa0538730af46e8dfd5d3701152b7e..992d0c001997f2ce31c11eff5c06f4777820e16d 100644
--- a/fpdfsdk/pdfwindow/PWL_FontMap.cpp
+++ b/fpdfsdk/pdfwindow/PWL_FontMap.cpp
@@ -43,10 +43,6 @@ CPWL_FontMap::~CPWL_FontMap() {
   Empty();
 }
 
-void CPWL_FontMap::SetSystemHandler(CFX_SystemHandler* pSystemHandler) {
-  m_pSystemHandler = pSystemHandler;
-}
-
 CPDF_Document* CPWL_FontMap::GetDocument() {
   if (!m_pPDFDoc) {
     if (CPDF_ModuleMgr::Get()) {
@@ -276,12 +272,10 @@ CFX_ByteString CPWL_FontMap::GetNativeFont(int32_t nCharset) {
     nCharset = GetNativeCharset();
 
   CFX_ByteString sFontName = GetDefaultFontByCharset(nCharset);
-  if (m_pSystemHandler) {
-    if (m_pSystemHandler->FindNativeTrueTypeFont(sFontName))
-      return sFontName;
+  if (m_pSystemHandler->FindNativeTrueTypeFont(sFontName))
+    return sFontName;
 
-    sFontName.clear();
-  }
+  sFontName.clear();
   return sFontName;
 }
 
@@ -322,11 +316,8 @@ CPDF_Font* CPWL_FontMap::AddSystemFont(CPDF_Document* pDoc,
   if (nCharset == DEFAULT_CHARSET)
     nCharset = GetNativeCharset();
 
-  if (m_pSystemHandler)
-    return m_pSystemHandler->AddNativeTrueTypeFontToPDF(pDoc, sFontName,
-                                                        nCharset);
-
-  return nullptr;
+  return m_pSystemHandler->AddNativeTrueTypeFontToPDF(pDoc, sFontName,
+                                                      nCharset);
 }
 
 CFX_ByteString CPWL_FontMap::EncodeFontAlias(const CFX_ByteString& sFontName,
@@ -484,13 +475,3 @@ int32_t CPWL_FontMap::CharSetFromUnicode(uint16_t word, int32_t nOldCharset) {
 
   return ANSI_CHARSET;
 }
-
-CPWL_DocFontMap::CPWL_DocFontMap(CFX_SystemHandler* pSystemHandler,
-                                 CPDF_Document* pAttachedDoc)
-    : CPWL_FontMap(pSystemHandler), m_pAttachedDoc(pAttachedDoc) {}
-
-CPWL_DocFontMap::~CPWL_DocFontMap() {}
-
-CPDF_Document* CPWL_DocFontMap::GetDocument() {
-  return m_pAttachedDoc;
-}