Verify java.util.Preferences against OpenJDK 8u121-b13.

The only code change is that the private method
findPreferencesFactory() was renamed to factory() to be
consistent with upstream.

Otherwise, this CL only tweaks/adds change markers.
Unused imports were left untouched.

Bug: 35910877
Test: Treehugger
Change-Id: I12fbd617dbaa3a9552c3ab2b52bf453c809d8bbc
1 file changed