tests/html: removed usage of deprecated unittest features

tests/html/canvasrenderingcontext2d_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 canvas_rendering_context_2d_test; import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 import 'dart:math';
 
 // Some rounding errors in the browsers.
@@ skipping 332 matching lines @@
         context.drawImage(img, 50, 50);
 
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelUnfilled(60, 60);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(70, 70);
       }));
       img.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
       img.src = dataUrl;
     });
 
     // Draw an image to the canvas from an image element and scale it.
     test('with 5 params', () {
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
 
       img.onLoad.listen(expectAsync((_) {
         context.drawImageToRect(img, new Rectangle(50, 50, 20, 20));
 
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelFilled(60, 60);
         expectPixelFilled(69, 69);
         expectPixelUnfilled(70, 70);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(80, 80);
       }));
       img.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
       img.src = dataUrl;
     });
 
     // Draw an image to the canvas from an image element and scale it.
     test('with 9 params', () {
       otherContext.fillStyle = "blue";
       otherContext.fillRect(5, 5, 5, 5);
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
@@ skipping 14 matching lines @@
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelFilled(60, 60);
         expectPixelFilled(69, 69);
         expectPixelUnfilled(70, 70);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(80, 80);
       }));
       img.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
       img.src = dataUrl;
     });
   });
 
   // These videos and base64 strings are the same video, representing 2
   // frames of 8x8 red pixels.
   // The videos were created with:
   //   convert -size 8x8 xc:red blank1.jpg
   //   convert -size 8x8 xc:red blank2.jpg
@@ skipping 59 matching lines @@
 
         expectPixelFilled(50, 50);
         expectPixelFilled(54, 54);
         expectPixelFilled(57, 57);
         expectPixelUnfilled(58, 58);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(70, 70);
       }));
 
       video.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
 
       if(video.canPlayType('video/webm; codecs="vp8.0, vorbis"', '') != '') {
         video.src = webmVideoUrl;
       } else if(video.canPlayType('video/mp4; codecs="avc1.4D401E, mp4a.40.2"',
             null) != '') {
         video.src = mp4VideoUrl;
       } else {
         window.console.log('Video is not supported on this system.');
       }
     });
 
     test('with 5 params', () {
       video.onCanPlay.listen(expectAsync((_) {
         context.drawImageToRect(video, new Rectangle(50, 50, 20, 20));
 
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelFilled(60, 60);
         expectPixelFilled(69, 69);
         expectPixelUnfilled(70, 70);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(80, 80);
       }));
       video.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
 
       if(video.canPlayType('video/webm; codecs="vp8.0, vorbis"', '') != '') {
         video.src = webmVideoUrl;
       } else if(video.canPlayType('video/mp4; codecs="avc1.4D401E, mp4a.40.2"',
             null) != '') {
         video.src = mp4VideoUrl;
       } else {
         // TODO(amouravski): Better fallback?
         window.console.log('Video is not supported on this system.');
       }
     });
 
     test('with 9 params', () {
       video.onCanPlay.listen(expectAsync((_) {
         context.drawImageToRect(video, new Rectangle(50, 50, 20, 20),
           sourceRect: new Rectangle(2, 2, 6, 6));
 
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelFilled(60, 60);
         expectPixelFilled(69, 69);
         expectPixelUnfilled(70, 70);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(80, 80);
       }));
       video.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
 
       if(video.canPlayType('video/webm; codecs="vp8.0, vorbis"', '') != '') {
         video.src = webmVideoUrl;
       } else if(video.canPlayType('video/mp4; codecs="avc1.4D401E, mp4a.40.2"',
             null) != '') {
         video.src = mp4VideoUrl;
       } else {
         // TODO(amouravski): Better fallback?
         window.console.log('Video is not supported on this system.');
@@ skipping 15 matching lines @@
         expectPixelFilled(50, 50);
         expectPixelFilled(55, 55);
         expectPixelFilled(59, 59);
         expectPixelFilled(60, 60);
         expectPixelFilled(69, 69);
         expectPixelUnfilled(70, 70);
         expectPixelUnfilled(0, 0);
         expectPixelUnfilled(80, 80);
       }));
       video.onError.listen((_) {
-        guardAsync(() {
-          fail('URL failed to load.');
-        });
+        fail('URL failed to load.');
       });
 
       if(video.canPlayType('video/webm; codecs="vp8.0, vorbis"', '') != '') {
         video.src = webmVideoDataUrl;
       } else if(video.canPlayType('video/mp4; codecs="avc1.4D401E, mp4a.40.2"',
             null) != '') {
         video.src = mp4VideoDataUrl;
       } else {
         // TODO(amouravski): Better fallback?
         window.console.log('Video is not supported on this system.');
@@ skipping 130 matching lines @@
 
       // The box does not draw after 20 pixels.
       expectPixelUnfilled(x - 10, y);
       expectPixelUnfilled(x + maxWidth + 1, y);
       expectPixelUnfilled(x + maxWidth + 20, y);
       expectPixelFilled(x, y);
       expectPixelFilled(x + 10, y);
     });
   });
 }