Use UnownedPtr<> in cpdf_streamcontentparser

Change-Id: I558ac625d842d1b3d9dfdaf4d7661d4c02c6244a
Reviewed-on: https://pdfium-review.googlesource.com/36133
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

core/fpdfapi/page/cpdf_streamcontentparser.cpp

diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 8f3e70a..0a03ed1 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -61,7 +61,7 @@
 
 class CPDF_StreamParserAutoClearer {
  public:
-  CPDF_StreamParserAutoClearer(CPDF_StreamParser** scoped_variable,
+  CPDF_StreamParserAutoClearer(UnownedPtr<CPDF_StreamParser>* scoped_variable,
                                CPDF_StreamParser* new_parser)
       : scoped_variable_(scoped_variable) {
     *scoped_variable_ = new_parser;
@@ -69,7 +69,7 @@
   ~CPDF_StreamParserAutoClearer() { *scoped_variable_ = nullptr; }
 
  private:
-  CPDF_StreamParser** scoped_variable_;
+  UnownedPtr<CPDF_StreamParser>* scoped_variable_;
 };
 
 CFX_FloatRect GetShadingBBox(CPDF_ShadingPattern* pShading,

core/fpdfapi/page/cpdf_streamcontentparser.h

diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.h b/core/fpdfapi/page/cpdf_streamcontentparser.h
index a5efe48..e972118 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.h
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.h
@@ -217,7 +217,7 @@
   const CFX_FloatRect m_BBox;
   uint32_t m_ParamStartPos;
   uint32_t m_ParamCount;
-  CPDF_StreamParser* m_pSyntax;
+  UnownedPtr<CPDF_StreamParser> m_pSyntax;
   std::unique_ptr<CPDF_AllStates> m_pCurStates;
   CPDF_ContentMark m_CurContentMark;
   std::vector<std::unique_ptr<CPDF_TextObject>> m_ClipTextList;