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}