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

Source/modules/webdatabase/SQLStatementBackend.cpp

Index: Source/modules/webdatabase/SQLStatementBackend.cpp
diff --git a/Source/modules/webdatabase/SQLStatementBackend.cpp b/Source/modules/webdatabase/SQLStatementBackend.cpp
index d9c35953150323ccdec5a15b632016bcc813daac..9d65703d7a2f5a6c47b01db3c335bf113c24a83f 100644
--- a/Source/modules/webdatabase/SQLStatementBackend.cpp
+++ b/Source/modules/webdatabase/SQLStatementBackend.cpp
@@ -71,10 +71,10 @@
 
 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,
@@ -89,6 +89,10 @@ SQLStatementBackend::SQLStatementBackend(PassOwnPtr<AbstractSQLStatement> fronte
     m_frontend->setBackend(this);
 }
 
+void SQLStatementBackend::trace(Visitor*)
+{
+}
+
 AbstractSQLStatement* SQLStatementBackend::frontend()
 {
     return m_frontend.get();