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

core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
index 2adf9f4e19f82865c7d3eae20a473c1aa5957e78..3ae04d7111cd669d9ea9c7adced77bb84915db81 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
@@ -307,8 +307,9 @@ void CPDF_DocPageData::ReleaseFont(CPDF_Dictionary* pFontDict) {
   }
 }
 
-CPDF_ColorSpace* CPDF_DocPageData::GetColorSpace(CPDF_Object* pCSObj,
-                                                 CPDF_Dictionary* pResources) {
+CPDF_ColorSpace* CPDF_DocPageData::GetColorSpace(
+    CPDF_Object* pCSObj,
+    const CPDF_Dictionary* pResources) {
   if (!pCSObj)
     return nullptr;