Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/call/rtc_event_log.cc

Index: webrtc/call/rtc_event_log.cc
diff --git a/webrtc/call/rtc_event_log.cc b/webrtc/call/rtc_event_log.cc
index 840b210d15378dbbdf1ee079886674fe6064d27b..7ea1e167a1e0a15e905c1e47bb722de84b97018f 100644
--- a/webrtc/call/rtc_event_log.cc
+++ b/webrtc/call/rtc_event_log.cc
@@ -38,7 +38,9 @@
 
 namespace webrtc {
 
-// No-op implementation is used if flag is not set, or in tests.
+#ifndef ENABLE_RTC_EVENT_LOG
+
+// No-op implementation if flag is not set.
 class RtcEventLogNullImpl final : public RtcEventLog {
  public:
   bool StartLogging(const std::string& file_name,
@@ -72,7 +74,7 @@
                              int32_t total_packets) override {}
 };
 
-#ifdef ENABLE_RTC_EVENT_LOG
+#else  // ENABLE_RTC_EVENT_LOG is defined
 
 class RtcEventLogImpl final : public RtcEventLog {
  public:
@@ -463,8 +465,4 @@
 #endif  // ENABLE_RTC_EVENT_LOG
 }
 
-std::unique_ptr<RtcEventLog> RtcEventLog::CreateNull() {
-  return std::unique_ptr<RtcEventLog>(new RtcEventLogNullImpl());
-}
-
 }  // namespace webrtc