Add m_pDocument in CPDF_Color and check if page date has been forced clear

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 c7c1e7a5650ccd979e4754e85df2e54199283994..bcb81966622b830eb4ff10f6f08dd074e4324c2a 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
@@ -8,19 +8,14 @@
 #include "pageint.h"
 
 CPDF_Pattern::CPDF_Pattern(const CFX_AffineMatrix* pParentMatrix) :
-    m_pPatternObj(NULL), m_PatternType(PATTERN_TILING), m_pDocument(NULL), m_pColor(NULL)
+    m_pPatternObj(NULL), m_PatternType(PATTERN_TILING), m_pDocument(NULL)
 {
     if (pParentMatrix) {
         m_ParentMatrix = *pParentMatrix;
     }
 }
-
 CPDF_Pattern::~CPDF_Pattern()
 {
-    if (m_pColor) {
-        m_pColor->SetValue(NULL, NULL, 0);
-        m_pColor = NULL;
-    }
 }
 CPDF_TilingPattern::CPDF_TilingPattern(CPDF_Document* pDoc, CPDF_Object* pPatternObj, const CFX_AffineMatrix* parentMatrix) :
     CPDF_Pattern(parentMatrix)