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

core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "pageint.h"
 
 #include "core/include/fdrm/fx_crypt.h"
 #include "core/include/fpdfapi/fpdf_module.h"
@@ skipping 289 matching lines @@
 
   CPDF_CountedFont* fontData = it->second;
   if (fontData->get()) {
     fontData->RemoveRef();
     if (fontData->use_count() == 0) {
       fontData->clear();
     }
   }
 }
 
-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;
 
   if (pCSObj->IsName()) {
     CFX_ByteString name = pCSObj->GetConstString();
     CPDF_ColorSpace* pCS = _CSFromName(name);
     if (!pCS && pResources) {
       CPDF_Dictionary* pList = pResources->GetDict(FX_BSTRC("ColorSpace"));
       if (pList) {
         pCSObj = pList->GetElementValue(name);
@@ skipping 275 matching lines @@
 }
 
 CPDF_CountedPattern* CPDF_DocPageData::FindPatternPtr(
     CPDF_Object* pPatternObj) const {
   if (!pPatternObj)
     return nullptr;
 
   auto it = m_PatternMap.find(pPatternObj);
   return it != m_PatternMap.end() ? it->second : nullptr;
 }