Getting rid of GetDefaultProfile & fixing multi user issues with accessibility

ash/system/tray_accessibility.cc

Index: ash/system/tray_accessibility.cc
diff --git a/ash/system/tray_accessibility.cc b/ash/system/tray_accessibility.cc
index fc77b3ec4a80920022b795488522bc12f966b8a7..f83ae5096eaa8dd8700cd93cdff8594aa96cd872 100644
--- a/ash/system/tray_accessibility.cc
+++ b/ash/system/tray_accessibility.cc
@@ -312,7 +312,8 @@ tray::AccessibilityDetailedView* TrayAccessibility::CreateDetailedMenu() {
 bool TrayAccessibility::GetInitialVisibility() {
   // Shows accessibility icon if any accessibility feature is enabled.
   // Otherwise, doen't show it.
-  return GetAccessibilityState() != A11Y_NONE;
+  return Shell::GetInstance()->accessibility_delegate()->
+             ShouldShowAccessibilityMenu();
 }
 
 views::View* TrayAccessibility::CreateDefaultView(user::LoginStatus status) {
@@ -326,10 +327,9 @@ views::View* TrayAccessibility::CreateDefaultView(user::LoginStatus status) {
   AccessibilityDelegate* delegate =
       Shell::GetInstance()->accessibility_delegate();
   if (login_ != user::LOGGED_IN_NONE &&
-      !delegate->ShouldAlwaysShowAccessibilityMenu() &&
-      // On login screen, keeps the initial visivility of the menu.
-      (status != user::LOGGED_IN_LOCKED || !show_a11y_menu_on_lock_screen_) &&
-      GetAccessibilityState() == A11Y_NONE)
+      !delegate->ShouldShowAccessibilityMenu() &&
+      // On login screen, keeps the initial visibility of the menu.
+      (status != user::LOGGED_IN_LOCKED || !show_a11y_menu_on_lock_screen_))
     return NULL;
 
   CHECK(default_ == NULL);