Upgraded the rest of Time.

Change-Id: I0ee083837e51d8f74a798b7ba14a3b6bb3859f35
diff --git a/aos/vision/events/epoll_events.cc b/aos/vision/events/epoll_events.cc
index 56b22e2..aaecdbf 100644
--- a/aos/vision/events/epoll_events.cc
+++ b/aos/vision/events/epoll_events.cc
@@ -57,10 +57,10 @@
  private:
   // Calculates the new timeout value to pass to epoll_wait.
   int CalculateTimeout() {
-    const ::aos::time::Time now = ::aos::time::Time::Now();
+    const monotonic_clock::time_point monotonic_now = monotonic_clock::now();
     int r = -1;
     for (EpollWait *c : waits_) {
-      const int new_timeout = c->Recalculate(now);
+      const int new_timeout = c->Recalculate(monotonic_now);
       if (new_timeout >= 0) {
         if (r < 0 || new_timeout < r) {
           r = new_timeout;