Fix libpeerconnection build after a recent libjingle roll that added an encoder factory to webrtc.

third_party/libjingle/overrides/init_webrtc.cc

Index: third_party/libjingle/overrides/init_webrtc.cc
diff --git a/third_party/libjingle/overrides/init_webrtc.cc b/third_party/libjingle/overrides/init_webrtc.cc
index c73b2702cd94ec2e0ca0970d1faa41078f2b6ad7..3fdb7241d9ef28165b0df46fc9b8bb8d4d2940a6 100644
--- a/third_party/libjingle/overrides/init_webrtc.cc
+++ b/third_party/libjingle/overrides/init_webrtc.cc
@@ -84,13 +84,15 @@ bool InitializeWebRtcModule() {
 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
     webrtc::AudioDeviceModule* adm,
     webrtc::AudioDeviceModule* adm_sc,
+    cricket::WebRtcVideoEncoderFactory* encoder_factory,
     cricket::WebRtcVideoDecoderFactory* decoder_factory) {
   // For convenience of tests etc, we call InitializeWebRtcModule here.
   // For Chrome however, InitializeWebRtcModule must be called
   // explicitly before the sandbox is initialized.  In that case, this call is
   // effectively a noop.
   InitializeWebRtcModule();
-  return g_create_webrtc_media_engine(adm, adm_sc, decoder_factory);
+  return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
+      decoder_factory);
 }
 
 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {