Fix -Wextra-semi warnings.

Starting from https://chromium-review.googlesource.com/c/1485012,
-Wextra-semi is enabled and WebRTC has some violations to fix.

This is a follow-up of https://webrtc-review.googlesource.com/c/123560.

Bug: webrtc:10355
Change-Id: I012b7497fc8991037fd77aa98f1579c22e08206f
Reviewed-on: https://webrtc-review.googlesource.com/c/124126
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26831}

modules/audio_coding/neteq/tools/neteq_quality_test.h

@@ -34,7 +34,7 @@ enum LossModes {
 
 class LossModel {
  public:
-  virtual ~LossModel(){};
+  virtual ~LossModel() {}
   virtual bool Lost(int now_ms) = 0;
 };