Make CPDF_Dictionary use unique pointers.

core/fpdfapi/page/cpdf_colorspace.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/page/cpdf_colorspace.h"
 
 #include <memory>
 
@@ skipping 327 matching lines @@
     return std::unique_ptr<CPDF_ColorSpace>(
         ColorspaceFromName(pObj->GetString()));
   }
   if (CPDF_Stream* pStream = pObj->AsStream()) {
     CPDF_Dictionary* pDict = pStream->GetDict();
     if (!pDict)
       return nullptr;
 
     for (const auto& it : *pDict) {
       std::unique_ptr<CPDF_ColorSpace> pRet;
-      CPDF_Object* pValue = it.second;
+      CPDF_Object* pValue = it.second.get();
       if (ToName(pValue))
         pRet.reset(ColorspaceFromName(pValue->GetString()));
       if (pRet)
         return pRet;
     }
     return nullptr;
   }
 
   CPDF_Array* pArray = pObj->AsArray();
   if (!pArray || pArray->IsEmpty())
@@ skipping 909 matching lines @@
 
   return m_pAltCS->GetRGB(results, R, G, B);
 }
 
 void CPDF_DeviceNCS::EnableStdConversion(bool bEnabled) {
   CPDF_ColorSpace::EnableStdConversion(bEnabled);
   if (m_pAltCS) {
     m_pAltCS->EnableStdConversion(bEnabled);
   }
 }