Fix XmppSignalStrategy to return correct result from SendStanza().

remoting/signaling/signal_strategy.h

 // Copyright 2014 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.
 
 #ifndef REMOTING_SIGNALING_SIGNAL_STRATEGY_H_
 #define REMOTING_SIGNALING_SIGNAL_STRATEGY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 68 matching lines @@
   virtual std::string GetLocalJid() const = 0;
 
   // Add a |listener| that can listen to all incoming
   // messages. Doesn't take ownership of the |listener|. All listeners
   // must be removed before this object is destroyed.
   virtual void AddListener(Listener* listener) = 0;
 
   // Remove a |listener| previously added with AddListener().
   virtual void RemoveListener(Listener* listener) = 0;
 
-  // Sends a raw XMPP stanza.
+  // Sends a raw XMPP stanza. Returns false if the stanza couldn't be send.
   virtual bool SendStanza(scoped_ptr<buzz::XmlElement> stanza) = 0;
 
   // Returns new ID that should be used for the next outgoing IQ
   // request.
   virtual std::string GetNextId() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SignalStrategy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_SIGNALING_SIGNAL_STRATEGY_H_