Remove set but unsed variables.

xfa/src/fxbarcode/oned/BC_OnedCode39Reader.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
 // Original code is licensed as follows:
 /*
  * Copyright 2008 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 49 matching lines @@
   int32_t nextStart = (*start)[1];
   delete start;
   int32_t end = row->GetSize();
   while (nextStart < end && !row->Get(nextStart)) {
     nextStart++;
   }
   CFX_ByteString result;
   CFX_Int32Array counters;
   counters.SetSize(9);
   FX_CHAR decodedChar;
-  int32_t lastStart;
   do {
     RecordPattern(row, nextStart, &counters, e);
     BC_EXCEPTION_CHECK_ReturnValue(e, "");
     int32_t pattern = ToNarrowWidePattern(&counters);
     if (pattern < 0) {
       e = BCExceptionNotFound;
       return "";
     }
     decodedChar = PatternToChar(pattern, e);
     BC_EXCEPTION_CHECK_ReturnValue(e, "");
     result += decodedChar;
-    lastStart = nextStart;
     for (int32_t i = 0; i < counters.GetSize(); i++) {
       nextStart += counters[i];
     }
     while (nextStart < end && !row->Get(nextStart)) {
       nextStart++;
     }
   } while (decodedChar != '*');
   result = result.Mid(0, result.GetLength() - 1);
   int32_t lastPatternSize = 0;
   for (int32_t j = 0; j < counters.GetSize(); j++) {
@@ skipping 190 matching lines @@
           break;
       }
       decoded += decodedChar;
       i++;
     } else {
       decoded += c;
     }
   }
   return decoded;
 }