Add a user id parameter to connections

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 10 matching lines @@
 
 class ApplicationInstance;
 
 // This class represents a request for the application manager to connect to an
 // application.
 class ConnectParams {
  public:
    ConnectParams();
    ~ConnectParams();
 
-  // Sets |source_|. If |source| is null, |source_| is reset.
-  void SetSource(ApplicationInstance* source);
-
   // The following methods set both |target_| and |target_url_request_|.
   void SetTargetURL(const GURL& target_url);
 
   void set_source(const Identity& source) { source_ = source;  }
   const Identity& source() const { return source_; }
   void set_target(const Identity& target) { target_ = target; }
   const Identity& target() const { return target_; }
 
   void set_remote_interfaces(shell::mojom::InterfaceProviderRequest value) {
     remote_interfaces_ = std::move(value);
@@ skipping 27 matching lines @@
   shell::mojom::InterfaceProviderPtr local_interfaces_;
   shell::mojom::Shell::ConnectCallback connect_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectParams);
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_CONNECT_PARAMS_H_