Extract a Connector interface from Shell that can be cloned & passed to other threads

mojo/shell/connect_params.h

 // Copyright 2015 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.
 
 #ifndef MOJO_SHELL_CONNECT_PARAMS_H_
 #define MOJO_SHELL_CONNECT_PARAMS_H_
 
 #include <string>
 #include <utility>
 
@@ skipping 32 matching lines @@
     return std::move(remote_interfaces_);
   }
 
   void set_local_interfaces(shell::mojom::InterfaceProviderPtr value) {
     local_interfaces_ = std::move(value);
   }
   shell::mojom::InterfaceProviderPtr TakeLocalInterfaces() {
     return std::move(local_interfaces_);
   }
 
-  void set_connect_callback(const shell::mojom::Shell::ConnectCallback& value) {
+  void set_connect_callback(
+      const shell::mojom::Connector::ConnectCallback& value) {
     connect_callback_ = value;
   }
-  const shell::mojom::Shell::ConnectCallback& connect_callback() const {
+  const shell::mojom::Connector::ConnectCallback& connect_callback() const {
     return connect_callback_;
   }
 
  private:
   // It may be null (i.e., is_null() returns true) which indicates that there is
   // no source (e.g., for the first application or in tests).
   Identity source_;
   // The identity of the application being connected to.
   Identity target_;
 
   shell::mojom::InterfaceProviderRequest remote_interfaces_;
   shell::mojom::InterfaceProviderPtr local_interfaces_;
-  shell::mojom::Shell::ConnectCallback connect_callback_;
+  shell::mojom::Connector::ConnectCallback connect_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectParams);
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_CONNECT_PARAMS_H_