Revert "Implementing window.createObjectURL*"

tests/html/url_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#library('url_test');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
-
-main() {
-  useHtmlConfiguration();
-
-  Blob createImageBlob() {
-    var canvas = new CanvasElement();
-    canvas.width = 100;
-    canvas.height = 100;
-
-    var context = canvas.context2d;
-    context.fillStyle = 'red';
-    context.fillRect(0, 0, canvas.width, canvas.height);
-
-    var dataUri = canvas.toDataURL('image/png');
-    var byteString = window.atob(dataUri.split(',')[1]);
-    var mimeString = dataUri.split(',')[0].split(':')[1].split(';')[0];
-
-    var arrayBuffer = new ArrayBuffer(byteString.length);
-    var dataArray = new Uint8Array.fromBuffer(arrayBuffer);
-    for (var i = 0; i < byteString.length; i++) {
-      dataArray[i] = byteString.charCodeAt(i);
-    }
-
-    var blob = new Blob([arrayBuffer], 'image/png');
-    return blob;
-  }
-
-  group('blob', () {
-    test('createObjectUrl', () {
-      var blob = createImageBlob();
-      var url = window.createObjectUrl(blob);
-      expect(url.length, greaterThan(0));
-      expect(url.startsWith('blob:'));
-
-      var img = new ImageElement();
-      img.on.load.add(expectAsync1((_) {
-        expect(img.complete, true);
-      }));
-      img.on.error.add((_) {
-        guardAsync(() {
-          expect(true, isFalse, 'URL failed to load.');
-        });
-      });
-      img.src = url;
-    });
-
-    test('revokeObjectUrl', () {
-      var blob = createImageBlob();
-      var url = window.createObjectUrl(blob);
-      expect(url.startsWith('blob:'));
-      window.revokeObjectUrl(url);
-
-      var img = new ImageElement();
-      // Image should fail to load since the URL was revoked.
-      img.on.error.add(expectAsync1((_) {
-      }));
-      img.on.load.add((_) {
-        guardAsync(() {
-          expect(true, isFalse, 'URL should not have loaded.');
-        });
-      });
-      img.src = url;
-    });
-
-  });
-}