Use string pools in some dictionaries

core/fpdfapi/fpdf_parser/cpdf_stream.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 "core/fpdfapi/fpdf_parser/include/cpdf_stream.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h"
@@ skipping 93 matching lines @@
   if (bKeepBuf) {
     m_pDataBuf = const_cast<uint8_t*>(pData);
   } else {
     m_pDataBuf = FX_Alloc(uint8_t, size);
     if (pData) {
       FXSYS_memcpy(m_pDataBuf, pData, size);
     }
   }
   m_dwSize = size;
   if (!m_pDict)
-    m_pDict = new CPDF_Dictionary;
+    m_pDict = new CPDF_Dictionary(nullptr);
   m_pDict->SetIntegerFor("Length", size);
   if (!bCompressed) {
     m_pDict->RemoveFor("Filter");
     m_pDict->RemoveFor("DecodeParms");
   }
 }
 
 FX_BOOL CPDF_Stream::ReadRawData(FX_FILESIZE offset,
                                  uint8_t* buf,
                                  uint32_t size) const {
@@ skipping 14 matching lines @@
   if (m_pDict)
     m_pDict->SetIntegerFor("Length", m_dwSize);
 }
 
 CFX_WideString CPDF_Stream::GetUnicodeText() const {
   CPDF_StreamAcc stream;
   stream.LoadAllData(this, FALSE);
   return PDF_DecodeText(stream.GetData(), stream.GetSize());
 }