Oilpan: Prepare to move AbstractSQLStatementBackend and SQLStatementBackend to Oilpan heap.

Source/modules/webdatabase/SQLStatementBackend.cpp

 /*
  * 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 53 matching lines @@
 //     =======================================================================================
 //     When we're done executing, we'll grab the next statement. But before we
 //     do that, getNextStatement() nullify SQLTransactionBackend::m_currentStatementBackend.
 //     This will trigger the deletion of the SQLStatementBackend and SQLStatement.
 //
 //     Note: unlike with SQLTransaction, there is no JS representation of SQLStatement.
 //     Hence, there is no GC dependency at play here.
 
 namespace WebCore {
 
-PassRefPtr<SQLStatementBackend> SQLStatementBackend::create(PassOwnPtr<AbstractSQLStatement> frontend,
+PassRefPtrWillBeRawPtr<SQLStatementBackend> SQLStatementBackend::create(PassOwnPtr<AbstractSQLStatement> frontend,
     const String& statement, const Vector<SQLValue>& arguments, int permissions)
 {
-    return adoptRef(new SQLStatementBackend(frontend, statement, arguments, permissions));
+    return adoptRefWillBeNoop(new SQLStatementBackend(frontend, statement, arguments, permissions));
 }
 
 SQLStatementBackend::SQLStatementBackend(PassOwnPtr<AbstractSQLStatement> frontend,
     const String& statement, const Vector<SQLValue>& arguments, int permissions)
     : m_frontend(frontend)
     , m_statement(statement.isolatedCopy())
     , m_arguments(arguments)
     , m_hasCallback(m_frontend->hasCallback())
     , m_hasErrorCallback(m_frontend->hasErrorCallback())
     , m_permissions(permissions)
 {
     m_frontend->setBackend(this);
 }
 
+void SQLStatementBackend::trace(Visitor*)
+{
+}
+
 AbstractSQLStatement* SQLStatementBackend::frontend()
 {
     return m_frontend.get();
 }
 
 PassRefPtr<SQLError> SQLStatementBackend::sqlError() const
 {
     return m_error;
 }
 
@@ skipping 125 matching lines @@
     if (lastExecutionFailedDueToQuota())
         m_error = nullptr;
 }
 
 bool SQLStatementBackend::lastExecutionFailedDueToQuota() const
 {
     return m_error && m_error->code() == SQLError::QUOTA_ERR;
 }
 
 } // namespace WebCore