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

webrtc/base/event_tracer.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include "webrtc/base/event_tracer.h"
@@ skipping 221 matching lines @@
   g_event_logger->AddTraceEvent(name, category_enabled, phase,
                                 rtc::TimeMicros(), 1, rtc::CurrentThreadId());
 }
 
 }  // namespace
 
 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);
 }
 
 void StartInternalCaptureToFile(FILE* file) {
   g_event_logger->Start(file, false);
 }
 
 bool StartInternalCapture(const char* filename) {
   FILE* file = fopen(filename, "w");
   if (!file) {
@@ skipping 15 matching lines @@
   RTC_DCHECK(old_logger);
   RTC_CHECK(rtc::AtomicOps::CompareAndSwapPtr(
                 &g_event_logger, old_logger,
                 static_cast<EventLogger*>(nullptr)) == old_logger);
   delete old_logger;
   webrtc::SetupEventTracer(nullptr, nullptr);
 }
 
 }  // namespace tracing
 }  // namespace rtc