RFA: 8170493: JNI exception pending in JavaComponentAccessibility.m

[Phil Race]

Bug: https://bugs.openjdk.java.net/browse/JDK-8170493
9 changeset: http://hg.openjdk.java.net/jdk9/client/jdk/rev/05b82284817f
9 review:
http://mail.openjdk.java.net/pipermail/awt-dev/2017-January/012533.html
http://mail.openjdk.java.net/pipermail/awt-dev/2017-February/012565.html

Identical one line fix as JDK9
JPRT used to verify the build.

-phil.