cros: Clean up SessionStateDelegate refs in Chrome

chrome/browser/ui/ash/palette_delegate_chromeos.cc

Index: chrome/browser/ui/ash/palette_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/palette_delegate_chromeos.cc b/chrome/browser/ui/ash/palette_delegate_chromeos.cc
index cc6db0d86cbcae37adf71c554c29ba8b4798de83..99443ac7fd154f64b01a6a788c493f0b5984e84f 100644
--- a/chrome/browser/ui/ash/palette_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/palette_delegate_chromeos.cc
@@ -56,11 +56,9 @@ bool PaletteDelegateChromeOS::HasNoteApp() {
   return chromeos::NoteTakingHelper::Get()->IsAppAvailable(profile_);
 }
 
-void PaletteDelegateChromeOS::ActiveUserChanged(const AccountId& account_id) {
-  const user_manager::User* user =
-      user_manager::UserManager::Get()->FindUser(account_id);
-  Profile* profile = ProfileHelper::Get()->GetProfileByUser(user);
-  SetProfile(profile);
+void PaletteDelegateChromeOS::ActiveUserChanged(
+    const user_manager::User* active_user) {
+  SetProfile(ProfileHelper::Get()->GetProfileByUser(active_user));
 }
 
 void PaletteDelegateChromeOS::Observe(
@@ -73,9 +71,9 @@ void PaletteDelegateChromeOS::Observe(
       SetProfile(ProfileManager::GetActiveUserProfile());
 
       // Add a session state observer to be able to monitor session changes.
-      if (!session_state_observer_.get() && ash::Shell::HasInstance()) {
+      if (!session_state_observer_.get()) {
         session_state_observer_.reset(
-            new ash::ScopedSessionStateObserver(this));
+            new user_manager::ScopedUserSessionStateObserver(this));
       }
       break;
     case chrome::NOTIFICATION_PROFILE_DESTROYED: {