Don't crash in ~HostNPScriptObject() when the object wasn't initialized.

remoting/jingle_glue/jingle_thread.cc

Index: remoting/jingle_glue/jingle_thread.cc
diff --git a/remoting/jingle_glue/jingle_thread.cc b/remoting/jingle_glue/jingle_thread.cc
index 742e3b191a77000bef0def41c3501da1a64c3f1c..4bf3e56effb125542c5d74a7e59a37a96c532367 100644
--- a/remoting/jingle_glue/jingle_thread.cc
+++ b/remoting/jingle_glue/jingle_thread.cc
@@ -153,9 +153,11 @@ JingleThread::~JingleThread() {
     Stop();
 }
 
-void JingleThread::Start() {
-  Thread::Start();
+bool JingleThread::Start() {
+  if (!Thread::Start())
+    return false;
   started_event_.Wait();
+  return true;
 }
 
 void JingleThread::Run() {