[fuchsia] Use new mx_deadline_after interface

runtime/bin/utils_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(HOST_OS_FUCHSIA)
 
 #include <errno.h>
 #include <magenta/syscalls.h>
 #include <magenta/types.h>
@@ skipping 79 matching lines @@
 }
 
 
 int64_t TimerUtils::GetCurrentMonotonicMicros() {
   int64_t ticks = mx_time_get(MX_CLOCK_MONOTONIC);
   return ticks / kNanosecondsPerMicrosecond;
 }
 
 
 void TimerUtils::Sleep(int64_t millis) {
-  mx_nanosleep(millis * kMicrosecondsPerMillisecond *
-               kNanosecondsPerMicrosecond);
+  mx_nanosleep(mx_deadline_after(
+          millis * kMicrosecondsPerMillisecond * kNanosecondsPerMicrosecond));
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_FUCHSIA)