Replace WebDatabaseObserver with callbacks

components/webdata/common/web_database_observer.h

Index: components/webdata/common/web_database_observer.h
diff --git a/components/webdata/common/web_database_observer.h b/components/webdata/common/web_database_observer.h
deleted file mode 100644
index 5ea80026afed53952096a1feaf915d7b2b2b207d..0000000000000000000000000000000000000000
--- a/components/webdata/common/web_database_observer.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2013 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_WEBDATA_COMMON_WEB_DATABASE_OBSERVER_H_
-#define COMPONENTS_WEBDATA_COMMON_WEB_DATABASE_OBSERVER_H_
-
-#include "components/webdata/common/webdata_export.h"
-#include "sql/init_status.h"
-
-// WebDatabase loads asynchronously on the DB thread. Clients on the UI thread
-// can use this interface to be notified when the load is complete, or if it
-// fails.
-class WEBDATA_EXPORT WebDatabaseObserver {
- public:
-  // Called when DB has been loaded successfully.
-  virtual void WebDatabaseLoaded() = 0;
-  // Called when load failed. |status| contains error code.
-  virtual void WebDatabaseLoadFailed(sql::InitStatus status) {};
-
- protected:
-  virtual ~WebDatabaseObserver() {}
-};
-
-
-#endif  // COMPONENTS_WEBDATA_COMMON_WEB_DATABASE_OBSERVER_H_