Revert of Plumbing for login apps device policy to extensions.

extensions/browser/pref_names.h

Index: extensions/browser/pref_names.h
diff --git a/extensions/browser/pref_names.h b/extensions/browser/pref_names.h
index f77b09a33a66ce33ca1394cb53552b07e249efc3..e221c35cc97b37bf100f5e2b14ccbc5a575b9b09 100644
--- a/extensions/browser/pref_names.h
+++ b/extensions/browser/pref_names.h
@@ -68,13 +68,6 @@
 // accessed through extensions::ExternalPolicyProvider.
 extern const char kInstallForceList[];
 
-// A list containing apps that Chrome will silently install on the sign-in
-// screen on ChromeOS at startup time. It is a list of strings, each string
-// contains an app ID and an update URL, delimited by a semicolon.
-// This preference is set by an admin policy, and meant to be only accessed
-// through extensions::ExternalPolicyProvider.
-extern const char kInstallSigninList[];
-
 // String pref for what version chrome was last time the extension prefs were
 // loaded.
 extern const char kLastChromeVersion[];