Enabling clang::find_bad_constructs for libjingle_peerconnection_api.

This CL removes //build/config/clang:find_bad_constructs from the
suppressed_configs list, which means that clang:find_bad_constructs
is now enabled on these translation units.

Bug: webrtc:9251, webrtc:163
Change-Id: I5475e574353c772910181495fdb3400b5f0e7399
Reviewed-on: https://webrtc-review.googlesource.com/87240
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24040}
diff --git a/api/stats/rtcstatscollectorcallback.h b/api/stats/rtcstatscollectorcallback.h
index 2c67bb8..9242217 100644
--- a/api/stats/rtcstatscollectorcallback.h
+++ b/api/stats/rtcstatscollectorcallback.h
@@ -19,7 +19,7 @@
 
 class RTCStatsCollectorCallback : public virtual rtc::RefCountInterface {
  public:
-  virtual ~RTCStatsCollectorCallback() {}
+  ~RTCStatsCollectorCallback() override = default;
 
   virtual void OnStatsDelivered(
       const rtc::scoped_refptr<const RTCStatsReport>& report) = 0;