replace NtpTime->Clock with Clock->NtpTime dependency

webrtc/modules/rtp_rtcp/source/time_util.h

Index: webrtc/modules/rtp_rtcp/source/time_util.h
diff --git a/webrtc/modules/rtp_rtcp/source/time_util.h b/webrtc/modules/rtp_rtcp/source/time_util.h
index 7bac5268a914f952280500358c6ed315b406d35b..69bbb0a59abff793c88e3ac0ae4cebcc9ac9fb72 100644
--- a/webrtc/modules/rtp_rtcp/source/time_util.h
+++ b/webrtc/modules/rtp_rtcp/source/time_util.h
@@ -22,11 +22,6 @@ inline uint32_t NtpToRtp(NtpTime ntp, uint32_t freq) {
   uint32_t tmp = (static_cast<uint64_t>(ntp.fractions()) * freq) >> 32;
   return ntp.seconds() * freq + tmp;
 }
-// Return the current RTP timestamp from the NTP timestamp
-// returned by the specified clock.
-inline uint32_t CurrentRtp(const Clock& clock, uint32_t freq) {
-  return NtpToRtp(NtpTime(clock), freq);
-}
 
 // Helper function for compact ntp representation:
 // RFC 3550, Section 4. Time Format.