ACM: Make AcmReceiver's ownership of NetEq more obvious

Bug: None
Change-Id: Iff544940fcbd651c967771c209c8c0c3aaeda9a1
Reviewed-on: https://chromium-review.googlesource.com/533073
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18607}
diff --git a/webrtc/modules/audio_coding/acm2/acm_receiver.cc b/webrtc/modules/audio_coding/acm2/acm_receiver.cc
index 8f21e89..8be08a2 100644
--- a/webrtc/modules/audio_coding/acm2/acm_receiver.cc
+++ b/webrtc/modules/audio_coding/acm2/acm_receiver.cc
@@ -41,9 +41,7 @@
   memset(last_audio_buffer_.get(), 0, AudioFrame::kMaxDataSizeSamples);
 }
 
-AcmReceiver::~AcmReceiver() {
-  delete neteq_;
-}
+AcmReceiver::~AcmReceiver() = default;
 
 int AcmReceiver::SetMinimumDelay(int delay_ms) {
   if (neteq_->SetMinimumDelay(delay_ms))