Remove duplicate entry in expectations.

Test: run-libcore-tests with gcstress
Change-Id: Ic4e61044b40ffbf081aca10e26494e86e995d704
diff --git a/tools/libcore_gcstress_failures.txt b/tools/libcore_gcstress_failures.txt
index e11f486..f0eb68e 100644
--- a/tools/libcore_gcstress_failures.txt
+++ b/tools/libcore_gcstress_failures.txt
@@ -32,7 +32,6 @@
           "libcore.java.text.DecimalFormatTest#testCurrencySymbolSpacing",
           "libcore.java.text.SimpleDateFormatTest#testLocales",
           "org.apache.harmony.tests.java.lang.ref.ReferenceQueueTest#test_remove",
-          "org.apache.harmony.tests.java.lang.ProcessManagerTest#testSleep",
           "org.apache.harmony.tests.java.lang.String2Test#test_getBytes",
           "org.apache.harmony.tests.java.text.DateFormatTest#test_getAvailableLocales",
           "org.apache.harmony.tests.java.util.TimerTest#testOverdueTaskExecutesImmediately",