Move ScopedFileDescriptor to dbus/file_descriptor.h

dbus/file_descriptor.cc

Index: dbus/file_descriptor.cc
diff --git a/dbus/file_descriptor.cc b/dbus/file_descriptor.cc
index d2d6a31f1e3cdc091a2497d04aa6da62c79f3633..e607fc01356d8ca284f0ea1732150a0a43a3bf69 100644
--- a/dbus/file_descriptor.cc
+++ b/dbus/file_descriptor.cc
@@ -2,12 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/bind.h"
 #include "base/files/file.h"
+#include "base/location.h"
 #include "base/logging.h"
+#include "base/threading/worker_pool.h"
 #include "dbus/file_descriptor.h"
 
 namespace dbus {
 
+void CHROME_DBUS_EXPORT FileDescriptor::Deleter::operator()(
+    FileDescriptor* fd) {
+  base::WorkerPool::PostTask(
+      FROM_HERE, base::Bind(&base::DeletePointer<FileDescriptor>, fd), false);
+}
+
 FileDescriptor::~FileDescriptor() {
   if (owner_)
     base::File auto_closer(value_);