Remove worker support of Web SQL Database.

LayoutTests/fast/workers/storage/resources/executesql-accepts-only-one-statement-sync.js

-function executeStatement(tx, expectedToPass, statement)
-{
-    var message;
-    try {
-        tx.executeSql(statement);
-        message = expectedToPass ? "PASS: " : "FAIL: ";
-    } catch (err) {
-        message = !expectedToPass ? "PASS: " : "FAIL: ";
-    }
-    postMessage(message + statement + ", " + db.lastErrorMessage);
-}
-
-var db = openDatabaseSync("ExecuteSQLAcceptsOnlyOneStatementTest", "1.0", "", 1);
-db.transaction(function(tx) {
-    tx.executeSql("CREATE TABLE IF NOT EXISTS Test (Foo INT)");
-    executeStatement(tx, true, "INSERT INTO Test VALUES (1)");
-    executeStatement(tx, true, "INSERT INTO Test VALUES (2);");
-    executeStatement(tx, true, "   INSERT INTO Test VALUES (3)    ");
-    executeStatement(tx, true, "   INSERT INTO Test VALUES (4);   ");
-    executeStatement(tx, true, "INSERT INTO Test VALUES (5)   ;");
-    executeStatement(tx, false, "INSERT INTO Test VALUES (6); garbage");
-    executeStatement(tx, false, "INSERT INTO Test VALUES (7); INSERT INTO Test VALUES (8)");
-    executeStatement(tx, false, "  INSERT INTO Test VALUES (9);   INSERT INTO Test VALUES (10);   ");
-});
-postMessage("done");