Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/media/engine/fakewebrtccall.cc

Index: webrtc/media/engine/fakewebrtccall.cc
diff --git a/webrtc/media/engine/fakewebrtccall.cc b/webrtc/media/engine/fakewebrtccall.cc
index 914a403f41e0e3045610a9b3e502cdb7e13ce2ab..fdf7cf36fc4bb678d09d9dc6a66c00a2c24a9d8f 100644
--- a/webrtc/media/engine/fakewebrtccall.cc
+++ b/webrtc/media/engine/fakewebrtccall.cc
@@ -478,4 +478,11 @@ void FakeCall::OnSentPacket(const rtc::SentPacket& sent_packet) {
   }
 }
 
+bool FakeCall::StartEventLog(rtc::PlatformFile log_file,
+                             int64_t max_size_bytes) {
+  return false;
+}
+
+void FakeCall::StopEventLog() {}
+
 }  // namespace cricket