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

remoting/host/chromoting_host_context.h

Index: remoting/host/chromoting_host_context.h
diff --git a/remoting/host/chromoting_host_context.h b/remoting/host/chromoting_host_context.h
index 8b6a7d7c41f0cc578675bed7da8a0344f654da61..f511c53abb959af9d508998a3aee997d5042020d 100644
--- a/remoting/host/chromoting_host_context.h
+++ b/remoting/host/chromoting_host_context.h
@@ -22,12 +22,12 @@ class ChromotingHostContext {
   explicit ChromotingHostContext(base::MessageLoopProxy* ui_message_loop);
   virtual ~ChromotingHostContext();
 
-  // TODO(ajwong): Move the Start/Stop methods out of this class. Then
+  // TODO(ajwong): Move the Start method out of this class. Then
   // create a static factory for construction, and destruction.  We
-  // should be able to remove the need for virtual functions below with that
-  // design, while preserving the relative simplicity of this API.
-  virtual void Start();
-  virtual void Stop();
+  // should be able to remove the need for virtual functions below
+  // with that design, while preserving the relative simplicity of
+  // this API.
+  virtual bool Start();
 
   virtual JingleThread* jingle_thread();