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diff --git a/Source/WebCore/Modules/indexeddb/IDBTransactionBackend.h b/Source/WebCore/Modules/indexeddb/IDBTransactionBackend.h
deleted file mode 100644
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--- a/Source/WebCore/Modules/indexeddb/IDBTransactionBackend.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Copyright (C) 2010 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef IDBTransactionBackend_h
-#define IDBTransactionBackend_h
-
-#if ENABLE(INDEXED_DATABASE)
-
-#include "IDBDatabaseBackend.h"
-#include "IDBDatabaseError.h"
-#include "IDBOperation.h"
-#include "Timer.h"
-#include <wtf/Deque.h>
-#include <wtf/HashSet.h>
-#include <wtf/RefPtr.h>
-
-namespace WebCore {
-
-class IDBCursorBackend;
-class IDBDatabaseCallbacks;
-
-class IDBTransactionBackend : public RefCounted<IDBTransactionBackend> {
-public:
-    static PassRefPtr<IDBTransactionBackend> create(IDBDatabaseBackend*, int64_t transactionId, PassRefPtr<IDBDatabaseCallbacks>, const Vector<int64_t>& objectStoreIds, IndexedDB::TransactionMode);
-    ~IDBTransactionBackend();
-
-    void commit();
-    void abort();
-    void abort(PassRefPtr<IDBDatabaseError>);
-
-    void run();
-    IndexedDB::TransactionMode mode() const  { return m_mode; }
-    const HashSet<int64_t>& scope() const  { return m_objectStoreIds; }
-
-    void scheduleTask(PassRefPtr<IDBOperation> task, PassRefPtr<IDBSynchronousOperation> abortTask = nullptr) { scheduleTask(IDBDatabaseBackend::NormalTask, task, abortTask); }
-    void scheduleTask(IDBDatabaseBackend::TaskType, PassRefPtr<IDBOperation>, PassRefPtr<IDBSynchronousOperation> abortTask = nullptr);
-
-    void registerOpenCursor(IDBCursorBackend*);
-    void unregisterOpenCursor(IDBCursorBackend*);
-
-    void addPreemptiveEvent()  { m_pendingPreemptiveEvents++; }
-    void didCompletePreemptiveEvent()  { m_pendingPreemptiveEvents--; ASSERT(m_pendingPreemptiveEvents >= 0); }
-
-    IDBDatabaseBackend& database() const  { return *m_database; }
-
-    void scheduleCreateObjectStoreOperation(const IDBObjectStoreMetadata&);
-    void scheduleDeleteObjectStoreOperation(const IDBObjectStoreMetadata&);
-    void scheduleVersionChangeOperation(int64_t requestedVersion, PassRefPtr<IDBCallbacks>, PassRefPtr<IDBDatabaseCallbacks>, const IDBDatabaseMetadata&);
-    void scheduleCreateIndexOperation(int64_t objectStoreId, const IDBIndexMetadata&);
-    void scheduleDeleteIndexOperation(int64_t objectStoreId, const IDBIndexMetadata&);
-    void scheduleGetOperation(const IDBDatabaseMetadata&, int64_t objectStoreId, int64_t indexId, PassRefPtr<IDBKeyRange>, IndexedDB::CursorType, PassRefPtr<IDBCallbacks>);
-    void schedulePutOperation(const IDBObjectStoreMetadata&, PassRefPtr<SharedBuffer> value, PassRefPtr<IDBKey>, IDBDatabaseBackend::PutMode, PassRefPtr<IDBCallbacks>, const Vector<int64_t>& indexIds, const Vector<IndexKeys>&);
-    void scheduleSetIndexesReadyOperation(size_t indexCount);
-    void scheduleOpenCursorOperation(int64_t objectStoreId, int64_t indexId, PassRefPtr<IDBKeyRange>, IndexedDB::CursorDirection, IndexedDB::CursorType, IDBDatabaseBackend::TaskType, PassRefPtr<IDBCallbacks>);
-    void scheduleCountOperation(int64_t objectStoreId, int64_t indexId, PassRefPtr<IDBKeyRange>, PassRefPtr<IDBCallbacks>);
-    void scheduleDeleteRangeOperation(int64_t objectStoreId, PassRefPtr<IDBKeyRange>, PassRefPtr<IDBCallbacks>);
-    void scheduleClearObjectStoreOperation(int64_t objectStoreId, PassRefPtr<IDBCallbacks>);
-
-    int64_t id() const { return m_id; }
-
-private:
-    IDBTransactionBackend(IDBDatabaseBackend*, int64_t id, PassRefPtr<IDBDatabaseCallbacks>, const HashSet<int64_t>& objectStoreIds, IndexedDB::TransactionMode);
-
-    enum State {
-        Unopened, // Backing store transaction not yet created.
-        Unused, // Backing store transaction created, but no tasks yet.
-        StartPending, // Enqueued tasks, but backing store transaction not yet started.
-        Running, // Backing store transaction started but not yet finished.
-        Finished, // Either aborted or committed.
-    };
-
-    void start();
-
-    bool isTaskQueueEmpty() const;
-    bool hasPendingTasks() const;
-
-    void taskTimerFired(Timer<IDBTransactionBackend>&);
-    void closeOpenCursors();
-
-    const HashSet<int64_t> m_objectStoreIds;
-    const IndexedDB::TransactionMode m_mode;
-
-    State m_state;
-    bool m_commitPending;
-    RefPtr<IDBDatabaseCallbacks> m_callbacks;
-    RefPtr<IDBDatabaseBackend> m_database;
-
-    typedef Deque<RefPtr<IDBOperation>> TaskQueue;
-    TaskQueue m_taskQueue;
-    TaskQueue m_preemptiveTaskQueue;
-    Deque<RefPtr<IDBSynchronousOperation>> m_abortTaskQueue;
-
-    // FIXME: delete the timer once we have threads instead.
-    Timer<IDBTransactionBackend> m_taskTimer;
-    int m_pendingPreemptiveEvents;
-
-    HashSet<IDBCursorBackend*> m_openCursors;
-
-    int64_t m_id;
-};
-
-} // namespace WebCore
-
-#endif // ENABLE(INDEXED_DATABASE)
-
-#endif // IDBTransactionBackend_h