Data from the autocomplete predictor wasn't deleted immediately when deleting browsing history.

chrome/browser/predictors/resource_prefetch_predictor.cc

Index: chrome/browser/predictors/resource_prefetch_predictor.cc
diff --git a/chrome/browser/predictors/resource_prefetch_predictor.cc b/chrome/browser/predictors/resource_prefetch_predictor.cc
index ded4d178be9778a85db793248ddce189d89781de..2e8f4ca746e298130aefec0e06707f54f4849672 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor.cc
+++ b/chrome/browser/predictors/resource_prefetch_predictor.cc
@@ -1125,8 +1125,7 @@ void ResourcePrefetchPredictor::OnURLsDeleted(
     const history::URLRows& deleted_rows,
     const std::set<GURL>& favicon_urls) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  if (INITIALIZED != initialization_state_)
-    return;
+  DCHECK(initialization_state_ == INITIALIZED);
 
   if (all_history) {
     DeleteAllUrls();
@@ -1144,7 +1143,6 @@ void ResourcePrefetchPredictor::OnURLsDeleted(
 void ResourcePrefetchPredictor::OnHistoryServiceLoaded(
     history::HistoryService* history_service) {
   OnHistoryAndCacheLoaded();
-  history_service_observer_.Remove(history_service);
 }
 
 void ResourcePrefetchPredictor::ConnectToHistoryService() {
@@ -1152,16 +1150,13 @@ void ResourcePrefetchPredictor::ConnectToHistoryService() {
   history::HistoryService* history_service =
       HistoryServiceFactory::GetForProfile(profile_,
                                            ServiceAccessType::EXPLICIT_ACCESS);
-  if (!history_service)
-    return;
+  DCHECK(history_service);
+  DCHECK(!history_service_observer_.IsObserving(history_service));
+  history_service_observer_.Add(history_service);
   if (history_service->BackendLoaded()) {
     // HistoryService is already loaded. Continue with Initialization.
     OnHistoryAndCacheLoaded();
-    return;
   }
-  DCHECK(!history_service_observer_.IsObserving(history_service));
-  history_service_observer_.Add(history_service);
-  return;
 }
 
 ////////////////////////////////////////////////////////////////////////////////