Make BrowsingDataHandler observe WebHistoryService deletions

components/history/core/browser/web_history_service_observer.h

Index: components/history/core/browser/web_history_service_observer.h
diff --git a/components/history/core/browser/web_history_service_observer.h b/components/history/core/browser/web_history_service_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..00fc817108cd048fd55794e731cd5646055c0f32
--- /dev/null
+++ b/components/history/core/browser/web_history_service_observer.h
@@ -0,0 +1,27 @@
+// Copyright 2016 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_WEB_HISTORY_SERVICE_OBSERVER_H_
+#define COMPONENTS_HISTORY_CORE_BROWSER_WEB_HISTORY_SERVICE_OBSERVER_H_
+
+namespace history {
+
+// Observes WebHistoryService actions. Currently only history expiration
+// is supported.
+// TODO(msramek): Consider defining ObservableHistoryService as a common
+// abstract ancestor for HistoryService and WebHistoryService. Then, we could
+// change the signatures of HistoryServiceObserver to use it for both classes.
+class WebHistoryServiceObserver {
+ public:
+  // Called after a successful WebHistoryService deletion request. This could
+  // be partial or complete history deletion.
+  virtual void OnWebHistoryDeleted() = 0;
+
+ protected:
+  virtual ~WebHistoryServiceObserver() {}
+};
+
+}  // history
+
+#endif  // COMPONENTS_HISTORY_CORE_BROWSER_WEB_HISTORY_SERVICE_OBSERVER_H_