Event log cleanup in tests.

webrtc/test/call_test.h

Index: webrtc/test/call_test.h
diff --git a/webrtc/test/call_test.h b/webrtc/test/call_test.h
index b96e5e6e112a7e831c08f15ea8b5eb2b87d95259..c9d7f32b579bf2f6e6c81eeead78845c72a85550 100644
--- a/webrtc/test/call_test.h
+++ b/webrtc/test/call_test.h
@@ -114,7 +114,7 @@ class CallTest : public ::testing::Test {
 
   Clock* const clock_;
 
-  webrtc::RtcEventLogNullImpl event_log_;
+  std::unique_ptr<webrtc::RtcEventLog> event_log_;
   std::unique_ptr<Call> sender_call_;
   std::unique_ptr<PacketTransport> send_transport_;
   VideoSendStream::Config video_send_config_;
@@ -227,7 +227,7 @@ class BaseTest : public RtpRtcpObserver {
 
   virtual void OnTestFinished();
 
-  webrtc::RtcEventLogNullImpl event_log_;
+  std::unique_ptr<webrtc::RtcEventLog> event_log_;
 };
 
 class SendTest : public BaseTest {