Even more reordering the methods in headers and implementation in net/.

net/base/file_stream_posix.cc

 // Copyright (c) 2010 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.
 
 // For 64-bit file access (off_t = off64_t, lseek64, etc).
 #define _FILE_OFFSET_BITS 64
 
 #include "net/base/file_stream.h"
 
 #include <sys/types.h>
@@ skipping 436 matching lines @@
     DCHECK(open_flags_ & base::PLATFORM_FILE_ASYNC);
     // If we're in async, make sure we don't have a request in flight.
     DCHECK(!async_context_->callback());
     async_context_->InitiateAsyncWrite(file_, buf, buf_len, callback);
     return ERR_IO_PENDING;
   } else {
     return WriteFile(file_, buf, buf_len);
   }
 }
 
-int FileStream::Flush() {
-  if (!IsOpen())
-    return ERR_UNEXPECTED;
-
-  return FlushFile(file_);
-}
-
 int64 FileStream::Truncate(int64 bytes) {
   if (!IsOpen())
     return ERR_UNEXPECTED;
 
   // We better be open for reading.
   DCHECK(open_flags_ & base::PLATFORM_FILE_WRITE);
 
   // Seek to the position to truncate from.
   int64 seek_position = Seek(FROM_BEGIN, bytes);
   if (seek_position != bytes)
     return ERR_UNEXPECTED;
 
   // And truncate the file.
   int result = ftruncate(file_, bytes);
   return result == 0 ? seek_position : MapErrorCode(errno);
 }
 
+int FileStream::Flush() {
+  if (!IsOpen())
+    return ERR_UNEXPECTED;
+
+  return FlushFile(file_);
+}
+
 }  // namespace net