Send IndexedDB observations through IDBDatabaseCallbacks.

content/child/indexed_db/indexed_db_message_filter.h

Index: content/child/indexed_db/indexed_db_message_filter.h
diff --git a/content/child/indexed_db/indexed_db_message_filter.h b/content/child/indexed_db/indexed_db_message_filter.h
deleted file mode 100644
index 4c727c67eb2fc92014b5e80253a4d814c9bbae11..0000000000000000000000000000000000000000
--- a/content/child/indexed_db/indexed_db_message_filter.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright 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 CONTENT_CHILD_INDEXED_DB_INDEXED_DB_MESSAGE_FILTER_H_
-#define CONTENT_CHILD_INDEXED_DB_INDEXED_DB_MESSAGE_FILTER_H_
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "content/child/worker_thread_message_filter.h"
-
-namespace content {
-
-class IndexedDBMessageFilter : public WorkerThreadMessageFilter {
- public:
-  explicit IndexedDBMessageFilter(ThreadSafeSender* thread_safe_sender);
-
- protected:
-  ~IndexedDBMessageFilter() override;
-
- private:
-  // WorkerThreadMessageFilter:
-  bool ShouldHandleMessage(const IPC::Message& msg) const override;
-  void OnFilteredMessageReceived(const IPC::Message& msg) override;
-  bool GetWorkerThreadIdForMessage(const IPC::Message& msg,
-                                   int* ipc_thread_id) override;
-
-  DISALLOW_COPY_AND_ASSIGN(IndexedDBMessageFilter);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_INDEXED_DB_INDEXED_DB_MESSAGE_FILTER_H_