Make CPDF_Object containers hold objects via unique pointers

core/fpdfapi/page/cpdf_allstates.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_allstates.h"
 
 #include "core/fpdfapi/page/pageint.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
@@ skipping 34 matching lines @@
 void CPDF_AllStates::SetLineDash(CPDF_Array* pArray,
                                  FX_FLOAT phase,
                                  FX_FLOAT scale) {
   m_GraphState.SetLineDash(pArray, phase, scale);
 }
 
 void CPDF_AllStates::ProcessExtGS(CPDF_Dictionary* pGS,
                                   CPDF_StreamContentParser* pParser) {
   for (const auto& it : *pGS) {
     const CFX_ByteString& key_str = it.first;
-    CPDF_Object* pElement = it.second;
+    CPDF_Object* pElement = it.second.get();
     CPDF_Object* pObject = pElement ? pElement->GetDirect() : nullptr;
     if (!pObject)
       continue;
 
     uint32_t key = key_str.GetID();
     switch (key) {
       case FXBSTR_ID('L', 'W', 0, 0):
         m_GraphState.SetLineWidth(pObject->GetNumber());
         break;
       case FXBSTR_ID('L', 'C', 0, 0):
@@ skipping 100 matching lines @@
       case FXBSTR_ID('A', 'I', 'S', 0):
         m_GeneralState.SetAlphaSource(!!pObject->GetInteger());
         break;
       case FXBSTR_ID('T', 'K', 0, 0):
         m_GeneralState.SetTextKnockout(!!pObject->GetInteger());
         break;
     }
   }
   m_GeneralState.SetMatrix(m_CTM);
 }