Rename VisitDatabaseObserver to HistoryServiceObserver

components/history/core/browser/history_service_observer.h

Index: components/history/core/browser/history_service_observer.h
diff --git a/components/history/core/browser/history_service_observer.h b/components/history/core/browser/history_service_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f1608be0edec83dec39f58ca085151702833403
--- /dev/null
+++ b/components/history/core/browser/history_service_observer.h
@@ -0,0 +1,30 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_
+#define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_
+
+#include "base/macros.h"
+#include "components/history/core/browser/history_types.h"
+
+class HistoryService;
+
+namespace history {
+
+class HistoryServiceObserver {
+ public:
+  HistoryServiceObserver() {}
+  virtual ~HistoryServiceObserver() {}
+
+  // Called on changes to the VisitDatabase.
+  virtual void OnAddVisit(HistoryService* history_service,
+                          const BriefVisitInfo& info) {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HistoryServiceObserver);
+};
+
+}  // namespace history
+
+#endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_