Manage WebSQL callbacks with OwnPtr instead of refcounting

Source/bindings/v8/custom/V8SQLTransactionCustom.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 72 matching lines @@
                 V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, sqlValue, value);
                 sqlValues.append(SQLValue(sqlValue));
             }
         }
     }
 
     SQLTransaction* transaction = V8SQLTransaction::toNative(info.Holder());
 
     ExecutionContext* executionContext = getExecutionContext();
 
-    RefPtr<SQLStatementCallback> callback;
+    OwnPtr<SQLStatementCallback> callback;
     if (info.Length() > 2 && !isUndefinedOrNull(info[2])) {
         if (!info[2]->IsObject()) {
             setDOMException(TypeMismatchError, info.GetIsolate());
             return;
         }
         callback = V8SQLStatementCallback::create(info[2], executionContext);
     }
 
-    RefPtr<SQLStatementErrorCallback> errorCallback;
+    OwnPtr<SQLStatementErrorCallback> errorCallback;
     if (info.Length() > 3 && !isUndefinedOrNull(info[3])) {
         if (!info[3]->IsObject()) {
             setDOMException(TypeMismatchError, info.GetIsolate());
             return;
         }
         errorCallback = V8SQLStatementErrorCallback::create(info[3], executionContext);
     }
 
     ExceptionState exceptionState(info.Holder(), info.GetIsolate());
-    transaction->executeSQL(statement, sqlValues, callback, errorCallback, exceptionState);
+    transaction->executeSQL(statement, sqlValues, callback.release(), errorCallback.release(), exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 } // namespace WebCore