cros: Clean up SessionStateDelegate refs in Chrome

chrome/browser/chromeos/accessibility/accessibility_manager.h

Index: chrome/browser/chromeos/accessibility/accessibility_manager.h
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.h b/chrome/browser/chromeos/accessibility/accessibility_manager.h
index c224c7322114f6fef356e7a3a79ce7f7257654c7..e81187f1a662f4a3d3e0b84020f2edf48c322045 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.h
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.h
@@ -8,7 +8,6 @@
 #include <set>
 
 #include "ash/common/accessibility_types.h"
-#include "ash/common/session/session_state_observer.h"
 #include "ash/common/shell_observer.h"
 #include "base/callback_forward.h"
 #include "base/callback_list.h"
@@ -20,6 +19,7 @@
 #include "chrome/browser/chromeos/accessibility/chromevox_panel.h"
 #include "chrome/browser/extensions/api/braille_display_private/braille_controller.h"
 #include "components/prefs/pref_change_registrar.h"
+#include "components/user_manager/user_manager.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/event_router.h"
@@ -92,7 +92,7 @@ class AccessibilityManager
     : public content::NotificationObserver,
       public extensions::api::braille_display_private::BrailleObserver,
       public extensions::ExtensionRegistryObserver,
-      public ash::SessionStateObserver,
+      public user_manager::UserManager::UserSessionStateObserver,
       public ash::ShellObserver,
       public input_method::InputMethodManager::Observer {
  public:
@@ -216,11 +216,10 @@ class AccessibilityManager
   // false.
   bool IsBrailleDisplayConnected() const;
 
-  // SessionStateObserver overrides:
-  void ActiveUserChanged(const AccountId& account_id) override;
+  // user_manager::UserManager::UserSessionStateObserver overrides:
+  void ActiveUserChanged(const user_manager::User* active_user) override;
 
   // ShellObserver overrides:
-  void OnAppTerminating() override;
   void OnFullscreenStateChanged(bool is_fullscreen,
                                 ash::WmWindow* root_window) override;
 
@@ -355,7 +354,8 @@ class AccessibilityManager
   content::NotificationRegistrar notification_registrar_;
   std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;
   std::unique_ptr<PrefChangeRegistrar> local_state_pref_change_registrar_;
-  std::unique_ptr<ash::ScopedSessionStateObserver> session_state_observer_;
+  std::unique_ptr<user_manager::ScopedUserSessionStateObserver>
+      session_state_observer_;
 
   PrefHandler large_cursor_pref_handler_;
   PrefHandler spoken_feedback_pref_handler_;