Fix clang_use_chrome_plugin for Mac and Skia builds

core/fxge/apple/fx_mac_imp.cpp

 // Copyright 2014 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 "core/fxge/apple/apple_int.h"
 #include "core/fxge/include/fx_ge.h"
 
 #if _FX_OS_ == _FX_MACOSX_
 static const struct {
   const FX_CHAR* m_pName;
   const FX_CHAR* m_pSubstName;
 } Base14Substs[] = {
     {"Courier", "Courier New"},
     {"Courier-Bold", "Courier New Bold"},
     {"Courier-BoldOblique", "Courier New Bold Italic"},
     {"Courier-Oblique", "Courier New Italic"},
     {"Helvetica", "Arial"},
     {"Helvetica-Bold", "Arial Bold"},
     {"Helvetica-BoldOblique", "Arial Bold Italic"},
     {"Helvetica-Oblique", "Arial Italic"},
     {"Times-Roman", "Times New Roman"},
     {"Times-Bold", "Times New Roman Bold"},
     {"Times-BoldItalic", "Times New Roman Bold Italic"},
     {"Times-Italic", "Times New Roman Italic"},
 };
+
 class CFX_MacFontInfo : public CFX_FolderFontInfo {
  public:
-  virtual void* MapFont(int weight,
-                        FX_BOOL bItalic,
-                        int charset,
-                        int pitch_family,
-                        const FX_CHAR* family,
-                        int& iExact);
+  // CFX_FolderFontInfo
+  void* MapFont(int weight,
+                FX_BOOL bItalic,
+                int charset,
+                int pitch_family,
+                const FX_CHAR* family,
+                int& iExact) override;
 };
+
 #define JAPAN_GOTHIC "Hiragino Kaku Gothic Pro W6"
 #define JAPAN_MINCHO "Hiragino Mincho Pro W6"
 static void GetJapanesePreference(CFX_ByteString& face,
                                   int weight,
                                   int picth_family) {
   if (face.Find("Gothic") >= 0) {
     face = JAPAN_GOTHIC;
     return;
   }
   if (!(picth_family & FXFONT_FF_ROMAN) && weight > 400) {
@@ skipping 60 matching lines @@
 
 void CFX_GEModule::InitPlatform() {
   m_pPlatformData = new CApplePlatform;
   m_pFontMgr->SetSystemFontInfo(IFX_SystemFontInfo::CreateDefault(nullptr));
 }
 void CFX_GEModule::DestroyPlatform() {
   delete (CApplePlatform*)m_pPlatformData;
   m_pPlatformData = nullptr;
 }
 #endif