Remove include only barcode.h and IWYU.

xfa/src/fxbarcode/datamatrix/BC_DataMatrixDecoder.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 2007 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
-#include "xfa/src/fxbarcode/barcode.h"
 #include "xfa/src/fxbarcode/common/BC_CommonBitMatrix.h"
 #include "xfa/src/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.h"
 #include "xfa/src/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixBitMatrixParser.h"
 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixDataBlock.h"
 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixDecodedBitStreamParser.h"
 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixDecoder.h"
 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixVersion.h"
+
 CBC_DataMatrixDecoder::CBC_DataMatrixDecoder() {
   m_rsDecoder = NULL;
 }
 void CBC_DataMatrixDecoder::Init() {
   m_rsDecoder =
       new CBC_ReedSolomonDecoder(CBC_ReedSolomonGF256::DataMatrixField);
 }
 CBC_DataMatrixDecoder::~CBC_DataMatrixDecoder() {
   if (m_rsDecoder != NULL) {
     delete m_rsDecoder;
@@ skipping 64 matching lines @@
   int32_t numECCodewords = codewordBytes.GetSize() - numDataCodewords;
   m_rsDecoder->Decode(&codewordsInts, numECCodewords, e);
   if (e != BCExceptionNO) {
     e = BCExceptionChecksumException;
     return;
   }
   for (i = 0; i < numDataCodewords; i++) {
     codewordBytes[i] = (uint8_t)codewordsInts[i];
   }
 }