Fix a memory leak where EventLogger is created two times in the event tracer.

webrtc/base/event_tracer.cc

Index: webrtc/base/event_tracer.cc
diff --git a/webrtc/base/event_tracer.cc b/webrtc/base/event_tracer.cc
index 8802095680092581982c51c43553fbfe6d1b220c..85d5c0b17b60a5531a2d1cb56803f97d0627e731 100644
--- a/webrtc/base/event_tracer.cc
+++ b/webrtc/base/event_tracer.cc
@@ -239,7 +239,6 @@ void SetupInternalTracer() {
   RTC_CHECK(rtc::AtomicOps::CompareAndSwapPtr(
                 &g_event_logger, static_cast<EventLogger*>(nullptr),
                 new EventLogger()) == nullptr);
-  g_event_logger = new EventLogger();
   webrtc::SetupEventTracer(InternalGetCategoryEnabled, InternalAddTraceEvent);
 }