Remove worker support of Web SQL Database.

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

-var window = {
-    testRunner: {
-        notifyDone: function() { postMessage("notifyDone"); }
-    }
-};
-var testRunner = window.testRunner;
-
-function log(s) {
-    postMessage("log:" + s);
-}
-
-onmessage = function(event) {
-    try {
-        if (event.data.indexOf("importScripts:") == 0) {
-            var scripts = event.data.substring("importScripts:".length).split(",");
-            for (var i in scripts)
-                scripts[i] = "../" + scripts[i];
-            importScripts(scripts);
-        } else if (event.data == "runTest")
-            runTest(); // Must be defined by some imported script.
-        else
-            log("Received unexpected message: " + event.data);
-    } catch (ex) {
-        log("Worker caught exception: " + ex);
-        window.testRunner.notifyDone();
-    }
-};
-
-var DB_TEST_SUFFIX = "_worker";
-
-function openDatabaseWithSuffix(name, version, description, size, callback)
-{
-    if (arguments.length > 4) {
-        return openDatabase(name + DB_TEST_SUFFIX, version, description, size, callback);
-    } else {
-        return openDatabase(name + DB_TEST_SUFFIX, version, description, size);
-    }
-}
-