Nomenclature improvements.

Change-Id: I809ab04b6ee74bb8141791e1f3f5d7e3f4efb61c
diff --git a/src/thread.cc b/src/thread.cc
index ce81a8b..7faf8f5 100644
--- a/src/thread.cc
+++ b/src/thread.cc
@@ -697,7 +697,7 @@
   if (new_state == Thread::kRunnable) {
     /*
      * Change our status to Thread::kRunnable.  The transition requires
-     * that we check for pending suspension, because the VM considers
+     * that we check for pending suspension, because the runtime considers
      * us to be "asleep" in all other states, and another thread could
      * be performing a GC now.
      *