Flush at the end of local file writing in FileWriter API.

webkit/fileapi/sandbox_file_stream_writer.cc

Index: webkit/fileapi/sandbox_file_stream_writer.cc
diff --git a/webkit/fileapi/sandbox_file_stream_writer.cc b/webkit/fileapi/sandbox_file_stream_writer.cc
index a12e00e743293460cc9269fe76503569fd511e7f..a00136ea387a7a4b01e8df3b2b709043b05644fd 100644
--- a/webkit/fileapi/sandbox_file_stream_writer.cc
+++ b/webkit/fileapi/sandbox_file_stream_writer.cc
@@ -234,4 +234,10 @@ bool SandboxFileStreamWriter::CancelIfRequested() {
   return true;
 }
 
+int SandboxFileStreamWriter::Flush(const net::CompletionCallback& callback) {
+  // For now, Flush is meaningful only for local native file access. It is no-op
+  // for sandboxed filesystem files (see the discussion in crbug.com/144790).
+  return net::OK;
+}
+
 }  // namespace fileapi