Revert "Make m_pShadingObj a CPDF_Stream instead of CPDF_Object."

core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
index d06f4811387612d388ed090fd6fcf85e573fd3ba..7b04d8cd3375139136db8654b8e5e67a247964c5 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
@@ -71,12 +71,12 @@ CPDF_ShadingPattern::CPDF_ShadingPattern(CPDF_Document* pDoc,
     CPDF_Dictionary* pDict = m_pPatternObj->GetDict();
     ASSERT(pDict != NULL);
     m_Pattern2Form = pDict->GetMatrix(FX_BSTRC("Matrix"));
-    m_pShadingObj = ToStream(pDict->GetElementValue(FX_BSTRC("Shading")));
+    m_pShadingObj = pDict->GetElementValue(FX_BSTRC("Shading"));
     if (parentMatrix) {
       m_Pattern2Form.Concat(*parentMatrix);
     }
   } else {
-    m_pShadingObj = ToStream(pPatternObj);
+    m_pShadingObj = pPatternObj;
   }
   m_ShadingType = 0;
   m_pCS = NULL;