Shell: switches cleanup.

shell/child_switches.h

Index: shell/child_switches.h
diff --git a/shell/child_switches.h b/shell/child_switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f65fdc104cbf02224f780875629a51963db6a74
--- /dev/null
+++ b/shell/child_switches.h
@@ -0,0 +1,18 @@
+// Copyright 2015 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.
+
+// Switches recognized by the child process (not really for user use).
+
+#ifndef SHELL_CHILD_SWITCHES_H_
+#define SHELL_CHILD_SWITCHES_H_
+
+namespace switches {
+
+// All switches in alphabetical order. The switches should be documented
+// alongside the definition of their values in the .cc file.
+extern const char kChildProcess[];
+
+}  // namespace switches
+
+#endif  // SHELL_CHILD_SWITCHES_H_