Oilpan: Prepare to move SQLTransactionWrapper and CangeVersionWrapper to Oilpan heap.

Source/modules/webdatabase/SQLTransactionBackend.h

 /*
  * Copyright (C) 2007, 2013 Apple 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
@@ skipping 30 matching lines @@
 namespace WebCore {
 
 class AbstractSQLTransaction;
 class DatabaseBackend;
 class SQLErrorData;
 class SQLiteTransaction;
 class SQLStatementBackend;
 class SQLTransactionBackend;
 class SQLValue;
 
-class SQLTransactionWrapper : public ThreadSafeRefCounted<SQLTransactionWrapper> {
+class SQLTransactionWrapper : public ThreadSafeRefCountedWillBeGarbageCollectedFinalized<SQLTransactionWrapper> {
 public:
     virtual ~SQLTransactionWrapper() { }
+    virtual void trace(Visitor*) = 0;
     virtual bool performPreflight(SQLTransactionBackend*) = 0;
     virtual bool performPostflight(SQLTransactionBackend*) = 0;
     virtual SQLErrorData* sqlError() const = 0;
     virtual void handleCommitFailedAfterPostflight(SQLTransactionBackend*) = 0;
 };
 
 class SQLTransactionBackend FINAL : public AbstractSQLTransactionBackend, public SQLTransactionStateMachine<SQLTransactionBackend> {
 public:
     static PassRefPtrWillBeRawPtr<SQLTransactionBackend> create(DatabaseBackend*,
-        PassRefPtrWillBeRawPtr<AbstractSQLTransaction>, PassRefPtr<SQLTransactionWrapper>, bool readOnly);
+        PassRefPtrWillBeRawPtr<AbstractSQLTransaction>, PassRefPtrWillBeRawPtr<SQLTransactionWrapper>, bool readOnly);
 
     virtual ~SQLTransactionBackend();
     virtual void trace(Visitor*) OVERRIDE;
 
     void lockAcquired();
     void performNextStep();
 
     DatabaseBackend* database() { return m_database.get(); }
     bool isReadOnly() { return m_readOnly; }
     void notifyDatabaseThreadIsShuttingDown();
 
 private:
     SQLTransactionBackend(DatabaseBackend*, PassRefPtrWillBeRawPtr<AbstractSQLTransaction>,
-        PassRefPtr<SQLTransactionWrapper>, bool readOnly);
+        PassRefPtrWillBeRawPtr<SQLTransactionWrapper>, bool readOnly);
 
     // APIs called from the frontend published via AbstractSQLTransactionBackend:
     virtual void requestTransitToState(SQLTransactionState) OVERRIDE;
     virtual SQLErrorData* transactionError() OVERRIDE;
     virtual AbstractSQLStatement* currentStatement() OVERRIDE;
     virtual void setShouldRetryCurrentStatement(bool) OVERRIDE;
     virtual void executeSQL(PassOwnPtr<AbstractSQLStatement>, const String& statement,
         const Vector<SQLValue>& arguments, int permissions) OVERRIDE;
 
     void doCleanup();
@@ skipping 18 matching lines @@
     SQLTransactionState nextStateForCurrentStatementError();
     SQLTransactionState nextStateForTransactionError();
     SQLTransactionState runCurrentStatementAndGetNextState();
 
     void getNextStatement();
 
     RefPtrWillBeMember<AbstractSQLTransaction> m_frontend; // Has a reference cycle, and will break in doCleanup().
     RefPtrWillBeMember<SQLStatementBackend> m_currentStatementBackend;
 
     RefPtrWillBeMember<DatabaseBackend> m_database;
-    RefPtr<SQLTransactionWrapper> m_wrapper;
+    RefPtrWillBeMember<SQLTransactionWrapper> m_wrapper;
     OwnPtr<SQLErrorData> m_transactionError;
 
     bool m_hasCallback;
     bool m_hasSuccessCallback;
     bool m_hasErrorCallback;
     bool m_shouldRetryCurrentStatement;
     bool m_modifiedDatabase;
     bool m_lockAcquired;
     bool m_readOnly;
     bool m_hasVersionMismatch;
 
     Mutex m_statementMutex;
     Deque<RefPtrWillBeMember<SQLStatementBackend> > m_statementQueue;
 
     OwnPtr<SQLiteTransaction> m_sqliteTransaction;
 };
 
 } // namespace WebCore
 
 #endif // SQLTransactionBackend_h