Change userid from a uint32_t to a string guid

mash/shell/shell_application_delegate.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 MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_
 #define MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 16 matching lines @@
     : public mojo::ShellClient,
       public mash::shell::mojom::Shell,
       public mojo::InterfaceFactory<mash::shell::mojom::Shell> {
  public:
   ShellApplicationDelegate();
   ~ShellApplicationDelegate() override;
 
  private:
   // mojo::ShellClient:
   void Initialize(mojo::Connector* connector, const std::string& url,
-                  uint32_t id, uint32_t user_id) override;
+                  const std::string& user_id, uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
   // mash::shell::mojom::Shell:
   void AddScreenlockStateListener(
       mojom::ScreenlockStateListenerPtr listener) override;
   void LockScreen() override;
   void UnlockScreen() override;
 
   // mojo::InterfaceFactory<mash::shell::mojom::Shell>:
   void Create(mojo::Connection* connection,
@@ skipping 18 matching lines @@
   mojo::BindingSet<mash::shell::mojom::Shell> bindings_;
   mojo::InterfacePtrSet<mojom::ScreenlockStateListener> screenlock_listeners_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellApplicationDelegate);
 };
 
 }  // namespace shell
 }  // namespace mash
 
 #endif  // MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_