Code change to avoid signed/unsigned mismatch warnings

core/fpdfapi/fpdf_parser/cpdf_array.cpp

 // 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
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_name.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_number.h"
@@ skipping 113 matching lines @@
 }
 
 CPDF_Stream* CPDF_Array::GetStreamAt(uint32_t i) const {
   return ToStream(GetDirectObjectAt(i));
 }
 
 CPDF_Array* CPDF_Array::GetArrayAt(uint32_t i) const {
   return ToArray(GetDirectObjectAt(i));
 }
 
-void CPDF_Array::RemoveAt(uint32_t i, int nCount) {
+void CPDF_Array::RemoveAt(uint32_t i, uint32_t nCount) {
   if (i >= (uint32_t)m_Objects.GetSize())
     return;
 
   if (nCount <= 0 || nCount > m_Objects.GetSize() - i)
     return;
 
-  for (int j = 0; j < nCount; ++j) {
+  for (uint32_t j = 0; j < nCount; ++j) {
     if (CPDF_Object* p = m_Objects.GetAt(i + j))
       p->Release();
   }
   m_Objects.RemoveAt(i, nCount);
 }
 
 void CPDF_Array::SetAt(uint32_t i,
                        CPDF_Object* pObj,
                        CPDF_IndirectObjectHolder* pObjs) {
   ASSERT(IsArray());
@@ skipping 46 matching lines @@
   ASSERT(IsArray());
   CPDF_Number* pNumber = new CPDF_Number(f);
   Add(pNumber);
 }
 
 void CPDF_Array::AddReference(CPDF_IndirectObjectHolder* pDoc,
                               uint32_t objnum) {
   ASSERT(IsArray());
   Add(new CPDF_Reference(pDoc, objnum));
 }