Fix multiple inclusion guards to match new pathnames

Change-Id: Id7735be1d75bc315733b1773fba45c1deb8ace43
diff --git a/runtime/barrier.h b/runtime/barrier.h
index 2b0429a..e0ad239 100644
--- a/runtime/barrier.h
+++ b/runtime/barrier.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef ART_SRC_BARRIER_H_
-#define ART_SRC_BARRIER_H_
+#ifndef ART_RUNTIME_BARRIER_H_
+#define ART_RUNTIME_BARRIER_H_
 
 #include "base/mutex.h"
 #include "locks.h"
@@ -52,4 +52,4 @@
 };
 
 }  // namespace art
-#endif  // ART_SRC_GC_BARRIER_H_
+#endif  // ART_RUNTIME_BARRIER_H_