Move event_tracer out of rtc_base_approved

Bug: webrtc:9838
Change-Id: Ic3c424729b5edd3e378c4195afe33ae5c88ad491
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/259312
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36637}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index b1847ce..a09ea4b 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -1035,6 +1035,7 @@
     "../../rtc_base:audio_format_to_string",
     "../../rtc_base:buffer",
     "../../rtc_base:checks",
+    "../../rtc_base:event_tracer",
     "../../rtc_base:gtest_prod",
     "../../rtc_base:logging",
     "../../rtc_base:macromagic",