Remove worker support of Web SQL Database.

LayoutTests/http/tests/workers/resources/sync-operations.js

 function removeAllInDirectorySync(directory)
 {
     if (!directory)
         return;
     var reader = directory.createReader();
     do {
         var entries = reader.readEntries();
         for (var i = 0; i < entries.length; ++i) {
             if (entries[i].isDirectory)
                 entries[i].removeRecursively();
             else
                 entries[i].remove();
         }
     } while (entries.length);
 }
 
 onmessage = function(evt)
 {
     try {
         // Increase the change of getting caught doing a sync operation
         // by repeating the opration multiple times.
         for (var i = 0; i < 10; ++i) {
-            if (evt.data == 'openDatabaseSync')
-                openDatabaseSync('', '', '', 1);
-            else if (evt.data == 'requestFileSystemSync') {
+            if (evt.data == 'requestFileSystemSync') {
                 if (!this.webkitRequestFileSystemSync)
                     return;
                 webkitRequestFileSystemSync(this.TEMPORARY, 100);
             } else if (evt.data == 'fileSyncOperations') {
                 if (!this.webkitRequestFileSystemSync)
                     return;
                 // Do many different sync filesystem operations. If this starts crashing,
                 // then a simple investigation would be to isolate these commands.
                 var fileSystem = webkitRequestFileSystemSync(this.TEMPORARY, 100);
 
@@ skipping 31 matching lines @@
         }
     } catch (e) {
         // Purposely ignore any exceptions. Since the whole purpose of this test is to try
         // to interrupt the synchronous operations, they will naturally throw exceptions,
         // but which ones throw exception isn't determinant and we don't want random output
         // showing up as a console message.
     }
 }
 
 postMessage('started');