Switch to standard integer types in pdf/.

pdf/pdfium/pdfium_mem_buffer_file_read.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PDF_PDFIUM_PDFIUM_MEM_BUFFER_FILE_READ_H_
 #define PDF_PDFIUM_PDFIUM_MEM_BUFFER_FILE_READ_H_
 
+#include <stddef.h>
 #include <stdlib.h>
 
 #include "third_party/pdfium/public/fpdfview.h"
 
 namespace chrome_pdf {
 
 // Implementation of FPDF_FILEACCESS from a memory buffer.
 class PDFiumMemBufferFileRead : public FPDF_FILEACCESS {
  public:
   PDFiumMemBufferFileRead(const void* data, size_t size);
   ~PDFiumMemBufferFileRead();
 
  private:
   static int GetBlock(void* param,
                       unsigned long position,
                       unsigned char* buf,
                       unsigned long size);
   const unsigned char* data_;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDFIUM_PDFIUM_MEM_BUFFER_FILE_READ_H_