Revert of Multiprofile security: Show a warning messagebox when desktop casting/sharing is turned on upon user

chrome/browser/ui/ash/session_state_delegate_chromeos.cc

Index: chrome/browser/ui/ash/session_state_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
index bcf70f4fe6d38cc90649745ae0626654b408e45c..2f7c8405472735753c8d8adf41e5b0f75af54ce7 100644
--- a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
@@ -6,9 +6,6 @@
 
 #include "ash/multi_profile_uma.h"
 #include "ash/session/session_state_observer.h"
-#include "ash/system/chromeos/multi_user/user_switch_util.h"
-#include "base/bind.h"
-#include "base/callback.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
@@ -167,7 +164,7 @@
             gaia::CanonicalizeEmail(gaia::SanitizeEmail(user_id)));
   if (user_id == user_manager::UserManager::Get()->GetActiveUser()->email())
     return;
-  TryToSwitchUser(user_id);
+  user_manager::UserManager::Get()->SwitchActiveUser(user_id);
 }
 
 void SessionStateDelegateChromeos::CycleActiveUser(CycleUser cycle_user) {
@@ -210,7 +207,7 @@
   }
 
   // Switch using the transformed |user_id|.
-  TryToSwitchUser(user_id);
+  user_manager::UserManager::Get()->SwitchActiveUser(user_id);
 }
 
 bool SessionStateDelegateChromeos::IsMultiProfileAllowedByPrimaryUserPolicy()
@@ -270,12 +267,3 @@
                     session_state_observer_list_,
                     SessionStateChanged(session_state_));
 }
-
-void DoSwitchUser(const std::string& user_id) {
-  user_manager::UserManager::Get()->SwitchActiveUser(user_id);
-}
-
-void SessionStateDelegateChromeos::TryToSwitchUser(
-    const std::string& user_id) {
-  ash::TrySwitchingActiveUser(base::Bind(&DoSwitchUser, user_id));
-}