com.sun.glass.ui.mac.MacWindow objects are not garbage collected as they are kept referenced
from native memory. As result performance benchmarks fail with OutOfMemoryError after several
iterations. Examples are Controls.TreeView-Keyword, Controls.TableView-XmasTree benchmarks.
The issue was introduced in build 8.0-graphics-scrum-1514, no issue in build 8.0-graphics-scrum-1513.
The issue exists in promoted build 8.0-b103.

Steps to reproduce:
> cd JFX_WS/tests/performance/Controls
> ant
> java -Xmx512m -Djavafx.animation.fullspeed=true -verbose:gc -XX:+HeapDumpOnOutOfMemoryError
       -cp "JFX_HOME/rt/lib/ext/jfxrt.jar:./dist/Controls.jar:../FXBenchmark/dist/FXBenchmark.jar:../../../import/benchmarks-2.1.1/benchmarks-2.1.1.jar"
 jrockit.bm.Main controls.bm.TreeViewBenchmark -i 100 -wt 0 -tr 2 -mode keyboard -cells 1000 50 -keysPerInjection 50