[NaCl SDK] nacl_io: Remove use of new/delete for data buffers.

native_client_sdk/src/libraries/nacl_io/memfs/mem_fs_node.h

 // Copyright 2013 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 LIBRARIES_NACL_IO_MEMFS_MEM_FS_NODE_H_
 #define LIBRARIES_NACL_IO_MEMFS_MEM_FS_NODE_H_
 
 #include "nacl_io/node.h"
 
-#include <vector>
-
 namespace nacl_io {
 
 class MemFsNode : public Node {
  public:
   explicit MemFsNode(Filesystem* filesystem);
 
  protected:
   virtual ~MemFsNode();
 
  public:
   // Normal read/write operations on a file
   virtual Error Read(const HandleAttr& attr,
                      void* buf,
                      size_t count,
                      int* out_bytes);
   virtual Error Write(const HandleAttr& attr,
                       const void* buf,
                       size_t count,
                       int* out_bytes);
   virtual Error FTruncate(off_t size);
 
  private:
-  void Resize(off_t size);
+  Error Resize(off_t size);
 
-  std::vector<char> data_;
+  char* data_;
+  size_t data_capacity_;
   friend class MemFs;
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_MEMFS_MEM_FS_NODE_H_