Fix and enable ART futexes.

Change-Id: I5c49e370de0dcf438352f0c657e77d8ba53f4d27
diff --git a/src/barrier.cc b/src/barrier.cc
index 052536a..7dd2d9b 100644
--- a/src/barrier.cc
+++ b/src/barrier.cc
@@ -40,7 +40,7 @@
 }
 
 Barrier::~Barrier() {
-  CHECK(!count_) << "Attempted to destory barrier with non zero count";
+  CHECK(!count_) << "Attempted to destroy barrier with non zero count";
 }
 
 }