Oilpan: Prepare to move AbstractSQLStatementBackend and SQLStatementBackend 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 68 matching lines @@
     // APIs called from the frontend published via AbstractSQLTransactionBackend:
     virtual void requestTransitToState(SQLTransactionState) OVERRIDE;
     virtual PassRefPtr<SQLError> 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();
 
-    void enqueueStatementBackend(PassRefPtr<SQLStatementBackend>);
+    void enqueueStatementBackend(PassRefPtrWillBeRawPtr<SQLStatementBackend>);
 
     // State Machine functions:
     virtual StateFunction stateFunctionFor(SQLTransactionState) OVERRIDE;
     void computeNextStateAndCleanupIfNeeded();
 
     // State functions:
     SQLTransactionState acquireLock();
     SQLTransactionState openTransactionAndPreflight();
     SQLTransactionState runStatements();
     SQLTransactionState postflightAndCommit();
     SQLTransactionState cleanupAndTerminate();
     SQLTransactionState cleanupAfterTransactionErrorCallback();
 
     SQLTransactionState unreachableState();
     SQLTransactionState sendToFrontendState();
 
     SQLTransactionState nextStateForCurrentStatementError();
     SQLTransactionState nextStateForTransactionError();
     SQLTransactionState runCurrentStatementAndGetNextState();
 
     void getNextStatement();
 
     RefPtrWillBeMember<AbstractSQLTransaction> m_frontend; // Has a reference cycle, and will break in doCleanup().
-    RefPtr<SQLStatementBackend> m_currentStatementBackend;
+    RefPtrWillBeMember<SQLStatementBackend> m_currentStatementBackend;
 
     RefPtrWillBeMember<DatabaseBackend> m_database;
     RefPtr<SQLTransactionWrapper> m_wrapper;
     RefPtr<SQLError> 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<RefPtr<SQLStatementBackend> > m_statementQueue;
+    Deque<RefPtrWillBeMember<SQLStatementBackend> > m_statementQueue;
 
     OwnPtr<SQLiteTransaction> m_sqliteTransaction;
 };
 
 } // namespace WebCore
 
 #endif // SQLTransactionBackend_h