Implement AudioReceiveStream::GetStats().

webrtc/test/call_test.cc

Index: webrtc/test/call_test.cc
diff --git a/webrtc/test/call_test.cc b/webrtc/test/call_test.cc
index 0986df5d61fcf32da3246e63acf58b6efca3c6ab..f2b5f91c7b0e313b7beb917f54ba0b65f03bc176 100644
--- a/webrtc/test/call_test.cc
+++ b/webrtc/test/call_test.cc
@@ -89,6 +89,11 @@ void CallTest::CreateReceiverCall(const Call::Config& config) {
   receiver_call_.reset(Call::Create(config));
 }
 
+void CallTest::DestroyCalls() {
+  sender_call_.reset(nullptr);
+  receiver_call_.reset(nullptr);
+}
+
 void CallTest::CreateSendConfig(size_t num_streams,
                                 Transport* send_transport) {
   assert(num_streams <= kNumSsrcs);