Remove final from RtcEventLogNullImpl

webrtc/logging/rtc_event_log/rtc_event_log.h

Index: webrtc/logging/rtc_event_log/rtc_event_log.h
diff --git a/webrtc/logging/rtc_event_log/rtc_event_log.h b/webrtc/logging/rtc_event_log/rtc_event_log.h
index 3f96556d8a56c29905ac56b4417df204973f5d96..45e8bf012b92327ed2b4929d5b1a05e961e74650 100644
--- a/webrtc/logging/rtc_event_log/rtc_event_log.h
+++ b/webrtc/logging/rtc_event_log/rtc_event_log.h
@@ -188,7 +188,7 @@ class RtcEventLog {
 };
 
 // No-op implementation is used if flag is not set, or in tests.
-class RtcEventLogNullImpl final : public RtcEventLog {
+class RtcEventLogNullImpl : public RtcEventLog {
  public:
   bool StartLogging(const std::string& file_name,
                     int64_t max_size_bytes) override {