Move the call to enable the WebRTC event log from PeerConnectionFactory to PeerConnection.

content/public/browser/webrtc_callback_interface.cc

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/public/browser/webrtc_callback_interface.h"
+
+#include "base/lazy_instance.h"
+#include "content/browser/media/webrtc/webrtc_callback_interface_impl.h"
+
+namespace content {
+
+namespace {
+
+static base::LazyInstance<WebRTCCallbackInterfaceImpl>::Leaky
+    g_webrtc_callback_interface = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+WebRTCCallbackInterface* WebRTCCallbackInterface::GetInstance() {
+  return static_cast<WebRTCCallbackInterface*>(
+      g_webrtc_callback_interface.Pointer());
+}
+}  // namespace content