Move application restart and relaunch code out of ExtensionService.

apps/switches.h

Index: apps/switches.h
diff --git a/apps/switches.h b/apps/switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..b43f920561486f43a2f0278e3c91946658cfaed6
--- /dev/null
+++ b/apps/switches.h
@@ -0,0 +1,16 @@
+// Copyright 2013 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.
+
+#ifndef APPS_SWITCHES_H_
+#define APPS_SWITCHES_H_
+
+namespace apps {
+
+// All switches in alphabetical order. The switches should be documented
+// alongside the definition of their values in the .cc file.
+extern const char kLoadAndLaunchApp[];
+
+}  // namespace apps
+
+#endif  // APPS_SWITCHES_H_