Fix crash when reloading packaged app.

apps/shell_window.h

Index: apps/shell_window.h
diff --git a/apps/shell_window.h b/apps/shell_window.h
index a10cb5bd553337afb52b60d27ab109006401a03d..a1e667bd83e96cca8da384b47a300e281c451a96 100644
--- a/apps/shell_window.h
+++ b/apps/shell_window.h
@@ -181,7 +181,6 @@ class ShellWindow : public content::NotificationObserver,
             ShellWindowContents* shell_window_contents,
             const CreateParams& params);
 
-
   const std::string& window_key() const { return window_key_; }
   const SessionID& session_id() const { return session_id_; }
   const extensions::Extension* extension() const { return extension_; }
@@ -299,6 +298,11 @@ class ShellWindow : public content::NotificationObserver,
   virtual bool IsWebContentsVisible(
       content::WebContents* web_contents) OVERRIDE;
 
+  // Remove the window from the ShellWindowRegistry and tell the native
+  // window to close. The native window won't be actually closed until
+  // OnNativeClose().
+  void Close();
+
   // Helper method to add a message to the renderer's DevTools console.
   void AddMessageToDevToolsConsole(content::ConsoleMessageLevel level,
                                    const std::string& message);