Roll libjingle to r124 and roll webrtc to 1888.

remoting/protocol/content_description.cc

Index: remoting/protocol/content_description.cc
===================================================================
--- remoting/protocol/content_description.cc	(revision 126778)
+++ remoting/protocol/content_description.cc	(working copy)
@@ -159,6 +159,14 @@
 
 ContentDescription::~ContentDescription() { }
 
+ContentDescription* ContentDescription::Copy() const {
+  if (!candidate_config_.get() || !authenticator_message_.get()) {
+    return NULL;
+  }
+  scoped_ptr<XmlElement> message(new XmlElement(*authenticator_message_));
+  return new ContentDescription(candidate_config_->Clone(), message.Pass());
+}
+
 // ToXml() creates content description for chromoting session. The
 // description looks as follows:
 //   <description xmlns="google:remoting">