Steps to reproduce:
 - start ensemble
 - open WebView sample
wait page loaded
 - close Ensemble by pressing x button

Observe the following in console log:


#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fa098ea2cd9, pid=9612, tid=140327203792640
#
# JRE version: 7.0_11-b21
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.6-b04 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V [libjvm.so+0x70bcd9]pure virtual method called