Fix a syntax error in SystemServiceRegistry

The syntax error was introduced by a bad conflict resolution
in http://ag/4324946.

Bug: 110097023
Test: Inspection only
Merged-In: I9e4eac70b944441f34491315cd1ce7fa2b9ae150
Change-Id: I546f2d010faa6f75033cf7e3e51ef7ed640854ed
(cherry picked from commit 10e276a24da1b5ac0b27f3172d16c59ef0eeab97)
1 file changed