Move application restart and relaunch code out of ExtensionService.

apps/switches.cc

Index: apps/switches.cc
diff --git a/apps/prefs.h b/apps/switches.cc
similarity index 51%
copy from apps/prefs.h
copy to apps/switches.cc
index 373486080e964c2b166904de8d9150da624ebeb0..60f94175f67827ed2e4b08d87be6a9b2c3a4122e 100644
--- a/apps/prefs.h
+++ b/apps/switches.cc
@@ -2,16 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef APPS_PREFS_H_
-#define APPS_PREFS_H_
-
-class PrefRegistrySimple;
+#include "apps/switches.h"
 
 namespace apps {
 
-// Register preferences for the apps system.
-void RegisterPrefs(PrefRegistrySimple* registry);
+// Loads an app from the specified directory and launches it.
+const char kLoadAndLaunchApp[] = "load-and-launch-app";
 
 }  // namespace apps
-
-#endif  // APPS_PREFS_H_