AEC3: Restrict default logging of some delay changes to VERBOSE

It leads to overly verbose test output. Example:
https://chromium-swarm.appspot.com/task?id=49bc386e0545ef10

Bug: webrtc:11278
Change-Id: I4a1c565f3aab94d98910722b23dcadc5fcde602a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/165962
Reviewed-by: Per Ã…hgren <peah@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30249}
diff --git a/modules/audio_processing/aec3/echo_remover.cc b/modules/audio_processing/aec3/echo_remover.cc
index 89ba736..b37e871 100644
--- a/modules/audio_processing/aec3/echo_remover.cc
+++ b/modules/audio_processing/aec3/echo_remover.cc
@@ -325,7 +325,7 @@
         gain_change_hangover_ = kMaxBlocksPerFrame;
         rtc::LoggingSeverity log_level =
             config_.delay.log_warning_on_delay_changes ? rtc::LS_WARNING
-                                                       : rtc::LS_INFO;
+                                                       : rtc::LS_VERBOSE;
         RTC_LOG_V(log_level)
             << "Gain change detected at block " << block_counter_;
       } else {