update_engine: fix missing include in CycleBreaker

BUG=None
TEST=unit tests

Change-Id: I7ab8b7bd3747943faf41943fa7037e26d6e70717
Reviewed-on: https://chromium-review.googlesource.com/882457
Commit-Ready: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
diff --git a/payload_generator/cycle_breaker.cc b/payload_generator/cycle_breaker.cc
index 52a6f60..bb91a19 100644
--- a/payload_generator/cycle_breaker.cc
+++ b/payload_generator/cycle_breaker.cc
@@ -18,6 +18,7 @@
 
 #include <inttypes.h>
 
+#include <limits>
 #include <set>
 #include <string>
 #include <utility>