Code change to avoid signed/unsigned mismatch warnings

core/fpdfapi/fpdf_parser/include/cpdf_array.h

 // Copyright 2016 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
 
 #ifndef CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_ARRAY_H_
 #define CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_ARRAY_H_
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_indirect_object_holder.h"
@@ skipping 26 matching lines @@
   FX_FLOAT GetFloatAt(uint32_t index) const { return GetNumberAt(index); }
   CFX_Matrix GetMatrix();
   CFX_FloatRect GetRect();
 
   void SetAt(uint32_t index,
              CPDF_Object* pObj,
              CPDF_IndirectObjectHolder* pObjs = nullptr);
   void InsertAt(uint32_t index,
                 CPDF_Object* pObj,
                 CPDF_IndirectObjectHolder* pObjs = nullptr);
-  void RemoveAt(uint32_t index, int nCount = 1);
+  void RemoveAt(uint32_t index, uint32_t nCount = 1);
 
   void Add(CPDF_Object* pObj, CPDF_IndirectObjectHolder* pObjs = nullptr);
   void AddNumber(FX_FLOAT f);
   void AddInteger(int i);
   void AddString(const CFX_ByteString& str);
   void AddName(const CFX_ByteString& str);
   void AddReference(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum);
   void AddReference(CPDF_IndirectObjectHolder* pDoc, CPDF_Object* obj) {
     AddReference(pDoc, obj->GetObjNum());
   }
 
  protected:
   ~CPDF_Array() override;
 
   CFX_ArrayTemplate<CPDF_Object*> m_Objects;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_ARRAY_H_