Add ContainsKey() and ContainsValue() and use them where appropriate.

core/src/fpdfapi/fpdf_font/ttgsubtable.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 "ttgsubtable.h"
 
 #include "core/include/fxge/fx_freetype.h"
 #include "core/include/fxge/fx_ge.h"
 #include "third_party/base/nonstd_unique_ptr.h"
+#include "third_party/base/stl_util.h"
 
 CFX_GlyphMap::CFX_GlyphMap() {}
 CFX_GlyphMap::~CFX_GlyphMap() {}
 extern "C" {
 static int _CompareInt(const void* p1, const void* p2) {
   return (*(FX_DWORD*)p1) - (*(FX_DWORD*)p2);
 }
 };
 struct _IntPair {
   int32_t key;
@@ skipping 57 matching lines @@
         for (int k = 0;
              k < ((ScriptList.ScriptRecord + i)->Script.LangSysRecord + j)
                      ->LangSys.FeatureCount;
              ++k) {
           FX_DWORD index =
               *(((ScriptList.ScriptRecord + i)->Script.LangSysRecord + j)
                     ->LangSys.FeatureIndex +
                 k);
           if (FeatureList.FeatureRecord[index].FeatureTag == tag[0] ||
               FeatureList.FeatureRecord[index].FeatureTag == tag[1]) {
-            if (m_featureMap.find(index) == m_featureMap.end()) {
+            if (!pdfium::ContainsKey(m_featureMap, index)) {
               m_featureMap[index] = index;
             }
           }
         }
       }
     }
     if (m_featureMap.empty()) {
       for (int i = 0; i < FeatureList.FeatureCount; i++) {
         if (FeatureList.FeatureRecord[i].FeatureTag == tag[0] ||
             FeatureList.FeatureRecord[i].FeatureTag == tag[1]) {
@@ skipping 304 matching lines @@
       FXFT_Load_Sfnt_Table(pFont->GetFace(), FT_MAKE_TAG('G', 'S', 'U', 'B'), 0,
                            pFont->GetSubData(), NULL);
   if (!error && pFont->GetSubData()) {
     nonstd::unique_ptr<CFX_GSUBTable> pGsubTable(new CFX_GSUBTable);
     if (pGsubTable->m_GsubImp.LoadGSUBTable((FT_Bytes)pFont->GetSubData())) {
       return pGsubTable.release();
     }
   }
   return NULL;
 }