CleanUp: Introduce UserInfo. Move session_state stuff to ash/session.

ash/system/user/accounts_detailed_view.cc

Index: ash/system/user/accounts_detailed_view.cc
diff --git a/ash/system/user/accounts_detailed_view.cc b/ash/system/user/accounts_detailed_view.cc
index fe5bb6808fcfab44e317ef96d4792cf824cf7a12..4a6a225eccd4e9d949d8f39512b08fb86a210dba 100644
--- a/ash/system/user/accounts_detailed_view.cc
+++ b/ash/system/user/accounts_detailed_view.cc
@@ -7,6 +7,7 @@
 #include <vector>
 
 #include "ash/multi_profile_uma.h"
+#include "ash/session/user_info.h"
 #include "ash/shell.h"
 #include "ash/system/tray/fixed_sized_scroll_view.h"
 #include "ash/system/tray/hover_highlight_view.h"
@@ -44,7 +45,7 @@ AccountsDetailedView::AccountsDetailedView(TrayUser* owner,
       add_account_button_(NULL),
       add_user_button_(NULL) {
   std::string user_id =
-      Shell::GetInstance()->session_state_delegate()->GetUserID(0);
+      Shell::GetInstance()->session_state_delegate()->GetUserInfo(0)->GetID();
   delegate_ =
       Shell::GetInstance()->system_tray_delegate()->GetUserAccountsDelegate(
           user_id);
@@ -117,11 +118,12 @@ void AccountsDetailedView::AddAddAccountButton() {
   SessionStateDelegate* session_state_delegate =
       Shell::GetInstance()->session_state_delegate();
   HoverHighlightView* add_account_button = new HoverHighlightView(this);
-  base::string16 user_name = session_state_delegate->GetUserGivenName(0);
+  const UserInfo* user_info = session_state_delegate->GetUserInfo(0);
+  base::string16 user_name = user_info->GetGivenName();
   if (user_name.empty())
-    user_name = session_state_delegate->GetUserDisplayName(0);
+    user_name = user_info->GetDisplayName();
   if (user_name.empty())
-    user_name = base::ASCIIToUTF16(session_state_delegate->GetUserEmail(0));
+    user_name = base::ASCIIToUTF16(user_info->GetEmail());
   add_account_button->AddLabel(
       l10n_util::GetStringFUTF16(IDS_ASH_STATUS_TRAY_ADD_ACCOUNT_LABEL,
                                  user_name),