Some WebNode tests crash JVM

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# A fatal error has been detected by the Java Runtime Environment:
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# SIGSEGV (0xb) at pc=0x0000000134087b3e, pid=52303, tid=0x000000000000f807
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# JRE version: Java(TM) SE Runtime Environment (9.0-b76) (build 1.9.0-ea-jigsaw-nightly-h3170-20150811-b76)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.9.0-ea-jigsaw-nightly-h3170-20150811-b76 mixed mode bsd-amd64 compressed oops)
# Problematic frame:
# C [libjfxwebkit.dylib+0xe2db3e] WTFCrash+0x3e
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# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /Users/javafx/java-client-9-clean/open/tests/functional/WebNodeAutomated/hs_err_pid52303.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#