Prefix LOG and CHECK with AOS_

This prepares us for introducing glog more widely and transitioning
things over where they make sense.

Change-Id: Ic6c208882407bc2153fe875ffc736d66f5c8ade5
diff --git a/aos/testing/prevent_exit.cc b/aos/testing/prevent_exit.cc
index 3190698..ed6644b 100644
--- a/aos/testing/prevent_exit.cc
+++ b/aos/testing/prevent_exit.cc
@@ -16,7 +16,7 @@
 }  // namespace
 
 void PreventExit() {
-  CHECK_EQ(atexit(TerminateExitHandler), 0);
+  AOS_CHECK_EQ(atexit(TerminateExitHandler), 0);
 }
 
 }  // namespace testing