Fix a few more warnings in chromium_code mode.

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.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 "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../../third_party/numerics/safe_math.h"
@@ skipping 1251 matching lines @@
         FX_DWORD totalsize = pObjStream->GetSize();
         CFX_SmartPointer<IFX_FileStream> file(FX_CreateMemoryStream((FX_LPBYTE)pData, (size_t)totalsize, FALSE));
         syntax.InitParser((IFX_FileStream*)file, 0);
         while (n) {
             FX_DWORD thisnum = syntax.GetDirectNum();
             FX_DWORD thisoff = syntax.GetDirectNum();
             if (thisnum == objnum) {
                 if (n == 1) {
                     size = totalsize - (thisoff + offset);
                 } else {
-                    FX_DWORD nextnum = syntax.GetDirectNum();
+                    syntax.GetDirectNum();  // Skip nextnum.
                     FX_DWORD nextoff = syntax.GetDirectNum();
                     size = nextoff - thisoff;
                 }
                 pBuffer = FX_Alloc(FX_BYTE, size);
                 FXSYS_memcpy32(pBuffer, pData + thisoff + offset, size);
                 return;
             }
             n --;
         }
         return;
@@ skipping 3122 matching lines @@
 {
     FX_INT32 iSize = m_childNode.GetSize();
     for (FX_INT32 i = 0; i < iSize; ++i) {
         CPDF_PageNode *pNode = (CPDF_PageNode*)m_childNode[i];
         if (pNode) {
             delete pNode;
         }
     }
     m_childNode.RemoveAll();
 }