Upgrading tests with unittest deprecations

tests/html/canvasrenderingcontext2d_test.dart

Index: tests/html/canvasrenderingcontext2d_test.dart
diff --git a/tests/html/canvasrenderingcontext2d_test.dart b/tests/html/canvasrenderingcontext2d_test.dart
index 3f17dc921cc39fa48b69916dbf58e1c2a0bc0d89..9ccb40cd392286cdc18fb6bf73fe92563d5f012c 100644
--- a/tests/html/canvasrenderingcontext2d_test.dart
+++ b/tests/html/canvasrenderingcontext2d_test.dart
@@ -339,7 +339,7 @@ main() {
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
 
-      img.onLoad.listen(expectAsync1((_) {
+      img.onLoad.listen(expectAsync((_) {
         context.drawImage(img, 50, 50);
 
         expectPixelFilled(50, 50);
@@ -362,7 +362,7 @@ main() {
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
 
-      img.onLoad.listen(expectAsync1((_) {
+      img.onLoad.listen(expectAsync((_) {
         context.drawImageToRect(img, new Rectangle(50, 50, 20, 20));
 
         expectPixelFilled(50, 50);
@@ -389,7 +389,7 @@ main() {
       var dataUrl = otherCanvas.toDataUrl('image/gif');
       var img = new ImageElement();
 
-      img.onLoad.listen(expectAsync1((_) {
+      img.onLoad.listen(expectAsync((_) {
         // This will take a 6x6 square from the first canvas from position 2,2
         // and then scale it to a 20x20 square and place it to the second
         // canvas at 50,50.
@@ -482,7 +482,7 @@ main() {
     tearDown(tearDownFunc);
 
     test('with 3 params', () {
-      video.onCanPlay.listen(expectAsync1((_) {
+      video.onCanPlay.listen(expectAsync((_) {
         context.drawImage(video, 50, 50);
 
         expectPixelFilled(50, 50);
@@ -510,7 +510,7 @@ main() {
     });
 
     test('with 5 params', () {
-      video.onCanPlay.listen(expectAsync1((_) {
+      video.onCanPlay.listen(expectAsync((_) {
         context.drawImageToRect(video, new Rectangle(50, 50, 20, 20));
 
         expectPixelFilled(50, 50);
@@ -540,7 +540,7 @@ main() {
     });
 
     test('with 9 params', () {
-      video.onCanPlay.listen(expectAsync1((_) {
+      video.onCanPlay.listen(expectAsync((_) {
         context.drawImageToRect(video, new Rectangle(50, 50, 20, 20),
           sourceRect: new Rectangle(2, 2, 6, 6));
 
@@ -578,7 +578,7 @@ main() {
     test('with 9 params', () {
       video = new VideoElement();
       canvas = new CanvasElement();
-      video.onCanPlay.listen(expectAsync1((_) {
+      video.onCanPlay.listen(expectAsync((_) {
         context.drawImageToRect(video, new Rectangle(50, 50, 20, 20),
           sourceRect: new Rectangle(2, 2, 6, 6));