Replace ApplicationImpl::CreateApplicationConnector() with a standalone helper function.

mojo/public/cpp/application/connect.h

 // Copyright 2014 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.
 
 // Helpers for using |ServiceProvider|s.
 
 #ifndef MOJO_PUBLIC_CPP_APPLICATION_CONNECT_H_
 #define MOJO_PUBLIC_CPP_APPLICATION_CONNECT_H_
 
+#include "mojo/public/cpp/bindings/interface_handle.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/interfaces/application/application_connector.mojom.h"
 #include "mojo/public/interfaces/application/service_provider.mojom.h"
 #include "mojo/public/interfaces/application/shell.mojom.h"
 
 namespace mojo {
 
 // Helper for using a |ServiceProvider|'s |ConnectToService()| that takes a
 // fully-typed interface request (and can use the default interface name). Note
 // that this can be used in conjunction with |GetProxy()|, etc. E.g.:
@@ skipping 31 matching lines @@
 template <typename Interface>
 inline void ConnectToService(ApplicationConnector* application_connector,
                              const std::string& application_url,
                              InterfaceRequest<Interface> request) {
   ServiceProviderPtr service_provider;
   application_connector->ConnectToApplication(
       application_url, GetProxy(&service_provider), nullptr);
   ConnectToService(service_provider.get(), request.Pass());
 }
 
+// Helper for getting an |InterfaceHandle<ApplicationConnector>| (which can be
+// passed to any thread) from the shell.
+InterfaceHandle<ApplicationConnector> CreateApplicationConnector(Shell* shell);
+
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_APPLICATION_CONNECT_H_