Revert "Migrate the IndexedDB backend from Blink to Chromium"

content/browser/indexed_db/indexed_db_transaction_coordinator.h

-// 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_
-#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_
-
-#include <map>
-#include <set>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/browser/indexed_db/list_set.h"
-
-namespace content {
-
-class IndexedDBTransaction;
-
-// Transactions are executed in the order the were created.
-class IndexedDBTransactionCoordinator {
- public:
-  IndexedDBTransactionCoordinator();
-  ~IndexedDBTransactionCoordinator();
-
-  // Called by transactions as they start and finish.
-  void DidCreateTransaction(IndexedDBTransaction* transaction);
-  void DidStartTransaction(IndexedDBTransaction* transaction);
-  void DidFinishTransaction(IndexedDBTransaction* transaction);
-
-#ifndef NDEBUG
-  bool IsActive(IndexedDBTransaction* transaction);
-#endif
-
-  // TODO(jsbell): API to handle closed connections. http://crbug.com/241821
-
- private:
-  void ProcessStartedTransactions();
-  bool CanRunTransaction(IndexedDBTransaction* transaction);
-
-  // This is just an efficient way to keep references to all transactions.
-  std::map<IndexedDBTransaction*, scoped_refptr<IndexedDBTransaction> >
-      transactions_;
-  // Transactions in different states are grouped below.
-  list_set<IndexedDBTransaction*> queued_transactions_;
-  std::set<IndexedDBTransaction*> started_transactions_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_