Move inline som functions ScopedDBusError into a .cc file

dbus/scoped_dbus_error.cc

+// Copyright (c) 2012 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.
+
+#include "dbus/scoped_dbus_error.h"
+
+namespace dbus {
+
+ScopedDBusError::ScopedDBusError() {
+  dbus_error_init(&error_);
+}
+
+ScopedDBusError::~ScopedDBusError() {
+  dbus_error_free(&error_);
+}
+
+bool ScopedDBusError::is_set() const {
+  return dbus_error_is_set(&error_);
+}
+
+}  // namespace dbus