Use std::vector as internal storage for CPDF_Array

core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp

Index: core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
diff --git a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 323602b0e10aa5e44b85d55b5674c3c422a3bd4c..74b16c86be1ea4bec662c75e30e204835f8ba664 100644
--- a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -97,7 +97,7 @@ int32_t PDF_CreatorAppendObject(const CPDF_Object* pObj,
       }
       offset += 1;
       const CPDF_Array* p = pObj->AsArray();
-      for (uint32_t i = 0; i < p->GetCount(); i++) {
+      for (size_t i = 0; i < p->GetCount(); i++) {
         CPDF_Object* pElement = p->GetObjectAt(i);
         if (pElement->GetObjNum()) {
           if (pFile->AppendString(" ") < 0) {
@@ -1203,7 +1203,7 @@ int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum,
       }
       m_Offset += 1;
       const CPDF_Array* p = pObj->AsArray();
-      for (uint32_t i = 0; i < p->GetCount(); i++) {
+      for (size_t i = 0; i < p->GetCount(); i++) {
         CPDF_Object* pElement = p->GetObjectAt(i);
         if (pElement->GetObjNum()) {
           if (m_File.AppendString(" ") < 0) {