Remove an extra "const" in fpdf_objects.

core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index a3b05689312966d14059fed5e9ca6713c05db3aa..56f5a2c4b4f489c8fd5497ada6862b7f8f70c3d0 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -46,7 +46,7 @@ void CPDF_Object::Destroy() {
   }
 }
 
-const CPDF_Object* const CPDF_Object::GetBasicObject() const {
+const CPDF_Object* CPDF_Object::GetBasicObject() const {
   const CPDF_Reference* pRef = AsReference();
   if (!pRef) {
     // This is not an indirect reference.