[fsp] Simplify aborting logic.

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_
 
 #include "base/basictypes.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
@@ skipping 22 matching lines @@
   virtual int Cancel(const net::CompletionCallback& callback) override;
   virtual int Flush(const net::CompletionCallback& callback) override;
 
  private:
   // Helper class for executing operations on the provided file system. All
   // of its methods must be called on UI thread. Callbacks are called on IO
   // thread.
   class OperationRunner;
 
   // State of the file stream writer.
-  enum State { NOT_INITIALIZED, INITIALIZING, INITIALIZED, FAILED };
+  enum State { NOT_INITIALIZED, INITIALIZING, INITIALIZED, EXECUTING, FAILED };
 
   // Called when OperationRunner::WriteOnUIThread is completed.
   void OnWriteFileCompleted(int buffer_length,
                             const net::CompletionCallback& callback,
                             base::File::Error result);
 
   // Called when Write() operation is completed with either a success or an
   // error.
   void OnWriteCompleted(net::CompletionCallback callback, int result);
 
-  // Called when Abort() operation is completed with either a success or an
-  // error.
-  void OnAbortCompleted(const net::CompletionCallback& callback,
-                        base::File::Error result);
-
   // Initializes the writer by opening the file. When completed with success,
   // runs the |pending_closure|. Otherwise, calls the |error_callback|.
   void Initialize(const base::Closure& pending_closure,
                   const net::CompletionCallback& error_callback);
 
   // Called when opening a file is completed with either a success or an error.
   void OnOpenFileCompleted(
       const base::Closure& pending_closure,
       const net::CompletionCallback& error_callback,
       base::File::Error result);
 
   // Same as Write(), but called after initializing is completed.
   void WriteAfterInitialized(scoped_refptr<net::IOBuffer> buffer,
                              int buffer_length,
                              const net::CompletionCallback& callback);
 
   storage::FileSystemURL url_;
   int64 current_offset_;
   scoped_refptr<OperationRunner> runner_;
   State state_;
 
   base::WeakPtrFactory<FileStreamWriter> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(FileStreamWriter);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_WRITER_H_