Eliminate NOTIFICATION_HISTORY_LOADED notification

chrome/browser/predictors/autocomplete_action_predictor.cc

Index: chrome/browser/predictors/autocomplete_action_predictor.cc
diff --git a/chrome/browser/predictors/autocomplete_action_predictor.cc b/chrome/browser/predictors/autocomplete_action_predictor.cc
index fed802ee7a256b6c24bed3d132d5637fb754f6e8..e13c0309904ba00c181d090ab2191bc6740a86f2 100644
--- a/chrome/browser/predictors/autocomplete_action_predictor.cc
+++ b/chrome/browser/predictors/autocomplete_action_predictor.cc
@@ -69,7 +69,8 @@ AutocompleteActionPredictor::AutocompleteActionPredictor(Profile* profile)
     : profile_(profile),
       main_profile_predictor_(NULL),
       incognito_predictor_(NULL),
-      initialized_(false) {
+      initialized_(false),
+      history_service_observer_(this) {
   if (profile_->IsOffTheRecord()) {
     main_profile_predictor_ = AutocompleteActionPredictorFactory::GetForProfile(
         profile_->GetOriginalProfile());
@@ -257,15 +258,6 @@ void AutocompleteActionPredictor::Observe(
       break;
     }
 
-    case chrome::NOTIFICATION_HISTORY_LOADED: {
-      TryDeleteOldEntries(content::Details<HistoryService>(details).ptr());
-
-      notification_registrar_.Remove(this,
-                                     chrome::NOTIFICATION_HISTORY_LOADED,
-                                     content::Source<Profile>(profile_));
-      break;
-    }
-
     default:
       NOTREACHED() << "Unexpected notification observed.";
       break;
@@ -481,8 +473,8 @@ void AutocompleteActionPredictor::CreateCaches(
   if (!TryDeleteOldEntries(history_service)) {
     // Wait for the notification that the history service is ready and the URL
     // DB is loaded.
-    notification_registrar_.Add(this, chrome::NOTIFICATION_HISTORY_LOADED,
-                                content::Source<Profile>(profile_));
+    if (history_service)
+      history_service_observer_.Add(history_service);
   }
 }
 
@@ -603,6 +595,16 @@ double AutocompleteActionPredictor::CalculateConfidenceForDbEntry(
   return number_of_hits / (number_of_hits + value.number_of_misses);
 }
 
+void AutocompleteActionPredictor::Shutdown() {
+  history_service_observer_.RemoveAll();
+}
+
+void AutocompleteActionPredictor::OnHistoryServiceLoaded(
+    HistoryService* history_service) {
+  TryDeleteOldEntries(history_service);
+  history_service_observer_.Remove(history_service);
+}
+
 AutocompleteActionPredictor::TransitionalMatch::TransitionalMatch() {
 }