Merge 159454 - 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
===================================================================
--- webkit/fileapi/sandbox_file_stream_writer.cc	(revision 160294)
+++ webkit/fileapi/sandbox_file_stream_writer.cc	(working copy)
@@ -234,4 +234,10 @@
   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