Make sure that Content Handled application can be connected multiple times.

mojo/shell/network_application_loader.h

Index: mojo/shell/network_application_loader.h
diff --git a/mojo/shell/network_application_loader.h b/mojo/shell/network_application_loader.h
index 0f426b0aa62f3529a932c11a2e583a29d007316c..562eed50df64fd6db7d9ff0788a531608503de52 100644
--- a/mojo/shell/network_application_loader.h
+++ b/mojo/shell/network_application_loader.h
@@ -32,6 +32,7 @@ class NetworkApplicationLoader : public ApplicationLoader,
   // ApplicationLoader overrides:
   virtual void Load(ApplicationManager* manager,
                     const GURL& url,
+                    ScopedMessagePipeHandle shell_handle,
                     scoped_refptr<LoadCallbacks> callbacks) override;
   virtual void OnApplicationError(ApplicationManager* manager,
                                   const GURL& url) override;