Remove worker support of Web SQL Database.

LayoutTests/fast/workers/storage/resources/change-version-sync-2.js

-var EXPECTED_VERSION_AFTER_RELOAD = '3';
-
-var db = openDatabaseSync("ChangeVersionTest", "", "Test the changeVersion() function.", 1);
-if (db.version == EXPECTED_VERSION_AFTER_RELOAD)
-    postMessage("PASS: db.version is " + EXPECTED_VERSION_AFTER_RELOAD + " as expected.");
-else
-    postMessage("FAIL: db.version is " + db.version + "; expected " + EXPECTED_VERSION_AFTER_RELOAD);
-
-// Reset the version; otherwise this test will fail the next time it's run
-db.changeVersion(db.version, "1");
-
-postMessage("done");