Move fileapi into its own component

webkit/fileapi/file_writer.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 WEBKIT_FILEAPI_FILE_WRITER_H_
 #define WEBKIT_FILEAPI_FILE_WRITER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "net/base/completion_callback.h"
+#include "webkit/fileapi/fileapi_export.h"
 
 namespace net {
 class IOBuffer;
 }
 
 namespace fileapi {
 
 // A generic interface for writing to a file-like object.
 //
 // TODO(kinuko): Consider better naming. (http://crbug.com/128483)
 // Note: this does not directly correspond to FileWriter in File API (which
 // is implemented by WebCore::FileWriter), though this class is used to
 // implement a part of it.  FileWriterDelegate is NOT a delegate of this
 // class either.
-class FileWriter {
+class FILEAPI_EXPORT_PRIVATE FileWriter {
  public:
   // Closes the file. If there's an in-flight operation, it is canceled (i.e.,
   // the callback function associated with the operation is not called).
   virtual ~FileWriter() {}
 
   // Writes to the current cursor position asynchronously.
   //
   // Up to buf_len bytes will be written.  (In other words, partial
   // writes are allowed.) If the write completed synchronously, it returns
   // the number of bytes written. If the operation could not be performed, it
@@ skipping 23 matching lines @@
   //
   // In either case, the callback function passed to the in-flight async
   // operation is dismissed immediately when Cancel() is called, and thus
   // will never be called.
   virtual int Cancel(const net::CompletionCallback& callback) = 0;
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_WRITER_H_