Make HistoryQuickProvider::DeleteMatch also delete the underlying URL from the History Database.

chrome/browser/autocomplete/history_provider.cc

Index: chrome/browser/autocomplete/history_provider.cc
diff --git a/chrome/browser/autocomplete/history_provider.cc b/chrome/browser/autocomplete/history_provider.cc
index 665f80b81df66f095a5b2e7df4460eed402bf56a..0018b47903242a1603f652fbad2c5ce300f649cb 100644
--- a/chrome/browser/autocomplete/history_provider.cc
+++ b/chrome/browser/autocomplete/history_provider.cc
@@ -26,10 +26,13 @@ void HistoryProvider::DeleteMatch(const AutocompleteMatch& match) {
   HistoryService* const history_service =
       HistoryServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
 
-  // Delete the match from the history DB.
+  // Delete the underlying URL along with all its visits from the history DB.
+  // The resulting HISTORY_URLS_DELETED notification will also cause all caches
+  // and indices to drop any data they might have stored pertaining to the URL.
   DCHECK(history_service);
   DCHECK(match.destination_url.is_valid());
   history_service->DeleteURL(match.destination_url);
+
   DeleteMatchFromMatches(match);
 }