Remove worker support of Web SQL Database.

LayoutTests/fast/workers/storage/resources/change-version-handle-reuse-sync.js

-var db = null;
-try {
-    var dbName = "ChangeVersionHandleReuseTest" + (new Date()).getTime();
-    db = openDatabaseSync(dbName, "", "Test that the DB handle is valid after changing the version.", 1);
-    var version = db.version;
-    var newVersion = version ? (parseInt(version) + 1).toString() : "1";
-    db.changeVersion(version, newVersion, function(tx) {
-        postMessage("PASS: changeVersion() transaction callback was called.");
-    });
-} catch (err) {
-    postMessage("FAIL: changeVersion() threw an exception: " + err);
-}
-
-try {
-    db.transaction(function(tx) {
-        try {
-            tx.executeSql("CREATE TABLE IF NOT EXISTS Test (Foo INT)");
-            tx.executeSql("SELECT * from Test");
-            postMessage("PASS: No exception thrown while executing statements.");
-        } catch (err) {
-            postMessage("FAIL: An exception was thrown while executing statements: " + err);
-        }
-    });
-    postMessage("PASS: No exception thrown while running a transaction.");
-} catch (err) {
-    postMessage("FAIL: An exception was thrown while running a transaction: " + err);
-}
-
-postMessage("done");