Replace RTC_DCHECK with EXPECT_TRUE in time estimator UT code

Replacing RTC_DCHECK code with EXPECT_TRUE in the remote ntp time estimator unittest code.
This to prevent test failures when building and testing in non-debug mode.

Bug: webrtc:15572
Change-Id: I372fcd6ee29a4ddc07d6b27ddd492dcea13d399f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/323181
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Stefan Holmer <stefan@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40936}

modules/rtp_rtcp/source/remote_ntp_time_estimator_unittest.cc

diff --git a/modules/rtp_rtcp/source/remote_ntp_time_estimator_unittest.cc b/modules/rtp_rtcp/source/remote_ntp_time_estimator_unittest.cc
index 8dbfaec..3737d66 100644
--- a/modules/rtp_rtcp/source/remote_ntp_time_estimator_unittest.cc
+++ b/modules/rtp_rtcp/source/remote_ntp_time_estimator_unittest.cc
@@ -44,7 +44,7 @@
     NtpTime ntp = remote_clock_.CurrentNtpTime();
 
     AdvanceTime(kTestRtt / 2);
-    RTC_DCHECK(estimator_.UpdateRtcpTimestamp(kTestRtt, ntp, rtcp_timestamp));
+    EXPECT_TRUE(estimator_.UpdateRtcpTimestamp(kTestRtt, ntp, rtcp_timestamp));
   }
 
   void SendRtcpSrInaccurately(TimeDelta ntp_error, TimeDelta networking_delay) {
@@ -53,7 +53,7 @@
     NtpTime ntp(static_cast<uint64_t>(remote_clock_.CurrentNtpTime()) +
                 ntp_error_fractions);
     AdvanceTime(kTestRtt / 2 + networking_delay);
-    RTC_DCHECK(estimator_.UpdateRtcpTimestamp(kTestRtt, ntp, rtcp_timestamp));
+    EXPECT_TRUE(estimator_.UpdateRtcpTimestamp(kTestRtt, ntp, rtcp_timestamp));
   }
 
   SimulatedClock local_clock_{kLocalClockInitialTime};