Address some comments and clean up

Change-Id: I538cf204f1c89d5fc81f8fc5e5800fcf1cf87359
diff --git a/runtime/barrier.h b/runtime/barrier.h
index 02f9f58..94977fb 100644
--- a/runtime/barrier.h
+++ b/runtime/barrier.h
@@ -51,7 +51,7 @@
   // to sleep, resulting in a deadlock.
 
   // Increment the count by delta, wait on condition if count is non zero.
-  void Increment(Thread* self, int delta) REQUIRES(!lock_);;
+  void Increment(Thread* self, int delta) REQUIRES(!lock_);
 
   // Increment the count by delta, wait on condition if count is non zero, with a timeout. Returns
   // true if time out occurred.