Remove worker support of Web SQL Database.

LayoutTests/fast/workers/storage/resources/multiple-transactions-sync.js

-var complete = 0;
-
-function checkCompletion()
-{
-    if (++complete == 2 && window.testRunner)
-        testRunner.notifyDone();
-}
-
-function runTest()
-{
-    var db = openDatabaseWithSuffix("MultipleTransactionsTest", "1.0", "Test to make sure multiple transactions can be queued at once for an HTML5 database", 32768);
-
-    db.transaction(function(tx) {
-        log("Transaction 1 Started");
-    }, function(err) {
-        log("Transaction 1 Errored - " + err);
-        checkCompletion();
-    }, function() {
-        log("Transaction 1 Succeeded");
-        checkCompletion();
-    });
-
-    db.transaction(function(tx) {
-        log("Transaction 2 Started");
-    }, function(err) {
-        log("Transaction 2 Errored - " + err);
-        checkCompletion();
-    }, function() {
-        log("Transaction 2 Succeeded");
-        checkCompletion();
-    });
-}