Oilpan: Prepare to move SQLResultSet and SQLResultSetRowList to oilpan heap.

Source/modules/webdatabase/SQLStatementBackend.h

Index: Source/modules/webdatabase/SQLStatementBackend.h
diff --git a/Source/modules/webdatabase/SQLStatementBackend.h b/Source/modules/webdatabase/SQLStatementBackend.h
index f22b877c8fc3e0b4a14ce5e762f096a91a8c5dbb..b5aed9703f6864324b31808cd670409752515b71 100644
--- a/Source/modules/webdatabase/SQLStatementBackend.h
+++ b/Source/modules/webdatabase/SQLStatementBackend.h
@@ -58,7 +58,7 @@ public:
 
     AbstractSQLStatement* frontend();
     virtual PassRefPtr<SQLError> sqlError() const OVERRIDE;
-    virtual PassRefPtr<SQLResultSet> sqlResultSet() const OVERRIDE;
+    virtual SQLResultSet* sqlResultSet() const OVERRIDE;
 
 private:
     SQLStatementBackend(PassOwnPtr<AbstractSQLStatement>, const String& statement,
@@ -74,7 +74,7 @@ private:
     bool m_hasErrorCallback;
 
     RefPtr<SQLError> m_error;
-    RefPtr<SQLResultSet> m_resultSet;
+    RefPtrWillBeMember<SQLResultSet> m_resultSet;
 
     int m_permissions;
 };