hg: jigsaw/jake/jdk: Minor clean up on StackWalker::getCallerClass spec

[mandy . chung]

Changeset: cbf1e85f7c11
Author:    mchung
Date:      2017-01-20 19:58 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/cbf1e85f7c11

Minor clean up on StackWalker::getCallerClass spec

! src/java.base/share/classes/java/lang/StackWalker.java