Oilpan: Prepare to move AbstractSQLStatement, SQLStatement, and SQLCallbackWrapper<T> to Oilpan hea…

Source/modules/webdatabase/AbstractSQLStatement.h

Index: Source/modules/webdatabase/AbstractSQLStatement.h
diff --git a/Source/modules/webdatabase/AbstractSQLStatement.h b/Source/modules/webdatabase/AbstractSQLStatement.h
index 1fb99128c3550253de17b6104fcabd3e5cf154a2..9ddcda699881da61c15ce02f15e961762b8750c0 100644
--- a/Source/modules/webdatabase/AbstractSQLStatement.h
+++ b/Source/modules/webdatabase/AbstractSQLStatement.h
@@ -26,15 +26,16 @@
 #ifndef AbstractSQLStatement_h
 #define AbstractSQLStatement_h
 
-#include "wtf/ThreadSafeRefCounted.h"
+#include "platform/heap/Handle.h"
 
 namespace WebCore {
 
 class AbstractSQLStatementBackend;
 
-class AbstractSQLStatement {
+class AbstractSQLStatement : public NoBaseWillBeGarbageCollectedFinalized<AbstractSQLStatement> {
 public:
     virtual ~AbstractSQLStatement() { }
+    virtual void trace(Visitor*) { }
 
     virtual void setBackend(AbstractSQLStatementBackend*) = 0;