Replace assert_promise_rejects with upstream promise_rejects.

third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-creation.html

Index: third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-creation.html
diff --git a/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-creation.html b/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-creation.html
index 8cfadc4edafdf985ee79df8d892e04b8071494c7..a7f4ff837ce68638ee132da50c0c3c008923e5ff 100644
--- a/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-creation.html
+++ b/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-creation.html
@@ -22,15 +22,17 @@ var testVideo = promise_test(function() {
     // disabled, or ended. grabFrame() would also reject if the video Track is
     // muted but that's a read-only property.
     stream.getVideoTracks()[0].enabled = false;
-    assert_promise_rejects(capturer.grabFrame(),
-                           'InvalidStateError',
-                           'ImageCapturer cannot grabFrame() of a disabled Track');
+    promise_rejects(this,

[Marijn Kruisselbrink, 2016/04/28 19:10:46]

These changes aren't strictly correct, but they're not making this completely
broken test any more broken than it already is. So rather than trying to fix
everything that's wrong with this test I'm just keeping the existing broken
non-behavior (in PS1 I tried to fix it, but changes made to these tests
yesterday broke this test even more, to the point that fixing it is more work
than I'm willing to spend on it).

[jsbell, 2016/04/29 17:39:07]

Acknowledged.

+                    'InvalidStateError',
+                    capturer.grabFrame(),
+                    'ImageCapturer cannot grabFrame() of a disabled Track');
 
     stream.getVideoTracks()[0].stop();
     assert_equals(stream.getVideoTracks()[0].readyState, 'ended');
-    assert_promise_rejects(capturer.grabFrame(),
-                           'InvalidStateError',
-                           'ImageCapturer cannot grabFrame() of a non-live Track');
+    promise_rejects(this,
+                    'InvalidStateError',
+                    capturer.grabFrame(),
+                    'ImageCapturer cannot grabFrame() of a non-live Track');
 
     this.done();
   });