Converted PhasedLoop over to monotonic_clock.

Change-Id: Ic8857c4412abb7c19dd3df4aaa5f6c8aa74e9dc6
diff --git a/frc971/wpilib/pdp_fetcher.cc b/frc971/wpilib/pdp_fetcher.cc
index 4e6be32..846de60 100644
--- a/frc971/wpilib/pdp_fetcher.cc
+++ b/frc971/wpilib/pdp_fetcher.cc
@@ -1,5 +1,7 @@
 #include "frc971/wpilib/pdp_fetcher.h"
 
+#include <chrono>
+
 #include "aos/common/logging/queue_logging.h"
 #include "aos/linux_code/init.h"
 #include "aos/common/util/phased_loop.h"
@@ -12,8 +14,8 @@
   ::aos::SetCurrentThreadName("PDPFetcher");
   ::std::unique_ptr<PowerDistributionPanel> pdp(new PowerDistributionPanel());
 
-  ::aos::time::PhasedLoop phased_loop(::aos::time::Time::InMS(20),
-                                      ::aos::time::Time::InMS(4));
+  ::aos::time::PhasedLoop phased_loop(::std::chrono::milliseconds(20),
+                                      ::std::chrono::milliseconds(4));
 
   while (true) {
     {