Switch to standard integer types in pdf/.

pdf/pdfium/pdfium_mem_buffer_file_read.cc

 // 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.
 
 #include "pdf/pdfium/pdfium_mem_buffer_file_read.h"
 
+#include <stddef.h>
 #include <string.h>
 
 namespace chrome_pdf {
 
 PDFiumMemBufferFileRead::PDFiumMemBufferFileRead(const void* data,
                                                  size_t size) {
   m_FileLen = size;
   m_Param = this;
   m_GetBlock = &GetBlock;
   data_ = reinterpret_cast<const unsigned char*>(data);
 }
 
 PDFiumMemBufferFileRead::~PDFiumMemBufferFileRead() {
 }
 
 int PDFiumMemBufferFileRead::GetBlock(void* param,
                                       unsigned long position,
                                       unsigned char* buf,
                                       unsigned long size) {
   const PDFiumMemBufferFileRead* data =
       reinterpret_cast<const PDFiumMemBufferFileRead*>(param);
   if (!data || position + size > data->m_FileLen)
     return 0;
   memcpy(buf, data->data_ + position, size);
   return 1;
 }
 
 }  // namespace chrome_pdf