Oilpan: Prepare to move AbstractSQLTransactionBackend, SQLTransactionBackend, and SQLTransactionCoo…

Source/modules/webdatabase/SQLTransaction.cpp

 /*
  * Copyright (C) 2007, 2008, 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 54 matching lines @@
     , m_executeSqlAllowed(false)
     , m_readOnly(readOnly)
 {
     ASSERT(m_database);
     ScriptWrappable::init(this);
 }
 
 void SQLTransaction::trace(Visitor* visitor)
 {
     visitor->trace(m_database);
+    visitor->trace(m_backend);
 }
 
 bool SQLTransaction::hasCallback() const
 {
     return m_callbackWrapper.hasCallback();
 }
 
 bool SQLTransaction::hasSuccessCallback() const
 {
     return m_successCallbackWrapper.hasCallback();
@@ skipping 223 matching lines @@
     m_successCallbackWrapper.clear();
     m_errorCallbackWrapper.clear();
 }
 
 PassOwnPtr<SQLTransactionErrorCallback> SQLTransaction::releaseErrorCallback()
 {
     return m_errorCallbackWrapper.unwrap();
 }
 
 } // namespace WebCore