NetEq: Use TickTimer in DelayManager

This change replaces packet_iat_count_ms_ and max_timer_ms_, two
time-counting member variables in DelayManager, with Stopwatch objects
obtained from a TickTimer.

BUG=webrtc:5608

Review-Url: https://codereview.webrtc.org/1929863002
Cr-Commit-Position: refs/heads/master@{#12554}
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl.cc b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
index 7bdb23c..ef1e6cb 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
@@ -60,7 +60,8 @@
       decoder_database(new DecoderDatabase),
       delay_peak_detector(new DelayPeakDetector(tick_timer.get())),
       delay_manager(new DelayManager(config.max_packets_in_buffer,
-                                     delay_peak_detector.get())),
+                                     delay_peak_detector.get(),
+                                     tick_timer.get())),
       dtmf_buffer(new DtmfBuffer(config.sample_rate_hz)),
       dtmf_tone_generator(new DtmfToneGenerator),
       packet_buffer(