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 2da9e0c3f0ebcccd273e73746b238721c377a650..a7165abdad21e3dc39e3bc2ce8a7a33e2bc78253 100644
--- a/webrtc/media/engine/fakewebrtccall.cc
+++ b/webrtc/media/engine/fakewebrtccall.cc
@@ -456,4 +456,12 @@ void FakeCall::SignalChannelNetworkState(webrtc::MediaType media,
 void FakeCall::OnSentPacket(const rtc::SentPacket& sent_packet) {
   last_sent_packet_ = sent_packet;
 }
+
+bool FakeCall::StartEventLog(rtc::PlatformFile log_file,
+                             int64_t max_size_bytes) {
+  return false;
+}
+
+void FakeCall::StopEventLog() {}
+
 }  // namespace cricket