Mark supervised profiles as such immediately when they're created.

chrome/browser/managed_mode/managed_user_service.cc

Index: chrome/browser/managed_mode/managed_user_service.cc
diff --git a/chrome/browser/managed_mode/managed_user_service.cc b/chrome/browser/managed_mode/managed_user_service.cc
index 96bb3a1d2f74659400d1839ad7e6933bf240e7f9..7015c3f6eb2c902edca6b690ee9abfbf55f6e7b5 100644
--- a/chrome/browser/managed_mode/managed_user_service.cc
+++ b/chrome/browser/managed_mode/managed_user_service.cc
@@ -293,11 +293,6 @@ void ManagedUserService::DidBlockNavigation(
   }
 }
 
-void ManagedUserService::AddInitCallback(
-    const base::Closure& callback) {
-  init_callbacks_.push_back(callback);
-}
-
 std::string ManagedUserService::GetDebugPolicyProviderName() const {
   // Save the string space in official builds.
 #ifdef NDEBUG
@@ -528,12 +523,6 @@ void ManagedUserService::GetManualExceptionsForHost(const std::string& host,
   }
 }
 
-void ManagedUserService::InitForTesting() {
-  DCHECK(!profile_->IsManaged());
-  profile_->GetPrefs()->SetString(prefs::kManagedUserId, "Test ID");
-  Init();
-}
-
 void ManagedUserService::InitSync(const std::string& refresh_token) {
   ProfileSyncService* service =
       ProfileSyncServiceFactory::GetForProfile(profile_);
@@ -611,14 +600,6 @@ void ManagedUserService::Init() {
   UpdateSiteLists();
   UpdateManualHosts();
   UpdateManualURLs();
-
-  // Call the callbacks to notify that the ManagedUserService has been
-  // initialized.
-  for (std::vector<base::Closure>::iterator it = init_callbacks_.begin();
-       it != init_callbacks_.end();
-       ++it) {
-    it->Run();
-  }
 }
 
 void ManagedUserService::RegisterAndInitSync(