Eliminate sending NOTIFICATION_HISTORY_KEYWORD_SEARCH_TERM_DELETED

chrome/browser/history/history_backend.h

Index: chrome/browser/history/history_backend.h
diff --git a/chrome/browser/history/history_backend.h b/chrome/browser/history/history_backend.h
index f531b23264598c1caf44394e71fbbae72239021b..4c85908e3e15f52af5e97b550c838ac68357eb61 100644
--- a/chrome/browser/history/history_backend.h
+++ b/chrome/browser/history/history_backend.h
@@ -150,6 +150,11 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
                                                 KeywordID keyword_id,
                                                 const base::string16& term) = 0;
 
+    // Notify HistoryService that keyword search term has been deleted.
+    // The event will be forwarded to the HistoryServiceObservers in the correct
+    // thread.
+    virtual void NotifyKeywordSearchTermDeleted(URLID url_id) = 0;
+
     // Broadcasts the specified notification to the notification service.
     // This is implemented here because notifications must only be sent from
     // the main thread. This is the only method that doesn't identify the