[cros] Move User class to user_manager component.

components/user_manager/user_type.h

Index: components/user_manager/user_type.h
diff --git a/components/user_manager/user_type.h b/components/user_manager/user_type.h
index e69c31667810492a945851b99c97ec0d30900615..249dfe5e137ff639fc52879d6ed219c86f355c9d 100644
--- a/components/user_manager/user_type.h
+++ b/components/user_manager/user_type.h
@@ -5,12 +5,10 @@
 #ifndef COMPONENTS_USER_MANAGER_USER_TYPE_H_
 #define COMPONENTS_USER_MANAGER_USER_TYPE_H_
 
-#include "components/user_manager/user_manager_export.h"
-
 namespace user_manager {
 
 // The user type. Used in a histogram; do not modify existing types.
-USER_MANAGER_EXPORT typedef enum {
+typedef enum {
   // Regular user, has a user name and password.
   USER_TYPE_REGULAR = 0,
   // Guest user, logs in without authentication.