Cleanup CPDF_DIBSource::LoadColorInfo() and ValidateDictParam().

core/src/fpdfapi/fpdf_render/render_int.h

Index: core/src/fpdfapi/fpdf_render/render_int.h
diff --git a/core/src/fpdfapi/fpdf_render/render_int.h b/core/src/fpdfapi/fpdf_render/render_int.h
index dbc9f1102bc2236c432aa48f4a6d3cef65a08a2a..2a9f922aac36ae6648c3a923da8c790518e55f5f 100644
--- a/core/src/fpdfapi/fpdf_render/render_int.h
+++ b/core/src/fpdfapi/fpdf_render/render_int.h
@@ -560,8 +560,8 @@ class CPDF_DIBSource : public CFX_DIBSource {
   FX_BOOL m_bHasMask;
 
  private:
-  FX_BOOL LoadColorInfo(CPDF_Dictionary* pFormResources,
-                        CPDF_Dictionary* pPageResources);
+  bool LoadColorInfo(const CPDF_Dictionary* pFormResources,
+                     const CPDF_Dictionary* pPageResources);
   DIB_COMP_DATA* GetDecodeAndMaskArray(FX_BOOL& bDefaultDecode,
                                        FX_BOOL& bColorKey);
   CPDF_DIBSource* LoadMask(FX_DWORD& MatteColor);