Remove worker support of Web SQL Database.

LayoutTests/fast/workers/storage/resources/database-worker-controller.js

-var databaseWorker = new Worker('resources/database-worker.js');
-
-databaseWorker.onerror = function(event) {
-    log("Caught an error from the worker!");
-    log(event);
-    for (var i in event)
-        log("event[" + i + "]: " + event[i]);
-};
-
-databaseWorker.onmessage = function(event) {
-    if (event.data.indexOf('log:') == 0) {
-        log(event.data.substring(4));
-    } else if (event.data == 'notifyDone') {
-        if (window.testRunner)
-            testRunner.notifyDone();
-    } else if (event.data.indexOf('setLocationHash:') == '0') {
-        location.hash = event.data.substring('setLocationHash:'.length);
-    } else if (event.data == 'back') {
-        history.back();
-    } else
-        throw new Error("Unrecognized message: " + event);
-};
-
-function log(message)
-{
-    document.getElementById("console").innerText += message + "\n";
-}
-
-function runTest(testFile)
-{
-    if (window.testRunner) {
-        testRunner.dumpAsText();
-        testRunner.waitUntilDone();
-    }
-    document.getElementById("console").innerText = "";
-    databaseWorker.postMessage("importScripts:../../../storage/websql/" + testFile);
-    databaseWorker.postMessage("runTest");
-}
-