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

remoting/jingle_glue/jingle_thread.cc

 // Copyright (c) 2011 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 "remoting/jingle_glue/jingle_thread.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "base/message_pump.h"
@@ skipping 135 matching lines @@
 
 JingleThread::~JingleThread() {
   // It is important to call Stop here. If we wait for the base class to
   // call Stop in it's d'tor, then JingleThread::Run() will access member
   // variables that are already gone. See similar comments in
   // base/threading/thread.h.
   if (message_loop_)
     Stop();
 }
 
-void JingleThread::Start() {
-  Thread::Start();
+bool JingleThread::Start() {
+  if (!Thread::Start())
+    return false;
   started_event_.Wait();
+  return true;
 }
 
 void JingleThread::Run() {
   JingleThreadMessageLoop message_loop(this);
   message_loop_ = &message_loop;
   message_loop_proxy_ = base::MessageLoopProxy::current();
 
   TaskPump task_pump;
   task_pump_ = &task_pump;
 
@@ skipping 22 matching lines @@
 
 base::MessageLoopProxy* JingleThread::message_loop_proxy() {
   return message_loop_proxy_;
 }
 
 TaskPump* JingleThread::task_pump() {
   return task_pump_;
 }
 
 }  // namespace remoting