IndexedDB: More database<->transaction relationship simplification

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 <vector>
 
 #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(scoped_refptr<IndexedDBTransaction> transaction);
-  void DidFinishTransaction(scoped_refptr<IndexedDBTransaction> transaction);
+  void DidFinishTransaction(IndexedDBTransaction* transaction);
+
+  bool IsRunningVersionChangeTransaction() const;
 
 #ifndef NDEBUG
   bool IsActive(IndexedDBTransaction* transaction);
 #endif
 
   // Makes a snapshot of the transaction queue. For diagnostics only.
   std::vector<const IndexedDBTransaction*> GetTransactions() const;
 
  private:
   void ProcessQueuedTransactions();
   bool CanStartTransaction(IndexedDBTransaction* const transaction,
                            const std::set<int64>& locked_scope) const;
 
   // Transactions in different states are grouped below.
   // list_set is used to provide stable ordering; required by spec
   // for the queue, convenience for diagnostics for the rest.
   typedef list_set<scoped_refptr<IndexedDBTransaction> > TransactionSet;
   TransactionSet queued_transactions_;
   TransactionSet started_transactions_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_