non-public default method

See https://bugs.openjdk.java.net/browse/JDK-8068253 as root cause and
https://bugs.openjdk.java.net/browse/JDK-8068254 as workaround in javac.

Reference expressions to default methods from package protected
interfaces should use implicit lambda methods to avoid runtime errors.

Change-Id: Iec5121bd4d8814a4348519dd25efc454deb61908
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Also-by: Stephan Herrmann <stephan.herrmann@berlin.de>