Oilpan: Prepare to move SQLError to oilpan heap.

Source/modules/webdatabase/SQLTransaction.cpp

Index: Source/modules/webdatabase/SQLTransaction.cpp
diff --git a/Source/modules/webdatabase/SQLTransaction.cpp b/Source/modules/webdatabase/SQLTransaction.cpp
index 89d2d42f3b3bc82baf486dfd8d4b9c2f5f8dd191..866459773200dec024fdf94050c161647ebc98c8 100644
--- a/Source/modules/webdatabase/SQLTransaction.cpp
+++ b/Source/modules/webdatabase/SQLTransaction.cpp
@@ -157,7 +157,7 @@ SQLTransactionState SQLTransaction::deliverTransactionCallback()
     SQLTransactionState nextState = SQLTransactionState::RunStatements;
     if (shouldDeliverErrorCallback) {
         m_database->reportStartTransactionResult(5, SQLError::UNKNOWN_ERR, 0);
-        m_transactionError = SQLError::create(SQLError::UNKNOWN_ERR, "the SQLTransactionCallback was null or threw an exception");
+        m_transactionError = SQLErrorData::create(SQLError::UNKNOWN_ERR, "the SQLTransactionCallback was null or threw an exception");
         nextState = SQLTransactionState::DeliverTransactionErrorCallback;
     }
     m_database->reportStartTransactionResult(0, -1, 0); // OK
@@ -174,11 +174,13 @@ SQLTransactionState SQLTransaction::deliverTransactionErrorCallback()
         // must be waiting in the idle state waiting for this state to finish.
         // Hence, it's thread safe to fetch the backend transactionError without
         // a lock.
-        if (!m_transactionError)
-            m_transactionError = m_backend->transactionError();
-
+        if (!m_transactionError) {
+            ASSERT(m_backend->transactionError());
+            m_transactionError = SQLErrorData::create(*m_backend->transactionError());
+        }
         ASSERT(m_transactionError);
-        errorCallback->handleEvent(m_transactionError.get());
+        RefPtrWillBeRawPtr<SQLError> error = SQLError::create(*m_transactionError);
+        errorCallback->handleEvent(error.get());
 
         m_transactionError = nullptr;
     }
@@ -205,7 +207,7 @@ SQLTransactionState SQLTransaction::deliverStatementCallback()
 
     if (result) {
         m_database->reportCommitTransactionResult(2, SQLError::UNKNOWN_ERR, 0);
-        m_transactionError = SQLError::create(SQLError::UNKNOWN_ERR, "the statement callback raised an exception or statement error callback did not return false");
+        m_transactionError = SQLErrorData::create(SQLError::UNKNOWN_ERR, "the statement callback raised an exception or statement error callback did not return false");
         return nextStateForTransactionError();
     }
     return SQLTransactionState::RunStatements;