Image Capture layouttests: correct mockImageCaptureReady error callback

third_party/WebKit/LayoutTests/imagecapture/getphotocapabilities.html

Index: third_party/WebKit/LayoutTests/imagecapture/getphotocapabilities.html
diff --git a/third_party/WebKit/LayoutTests/imagecapture/getphotocapabilities.html b/third_party/WebKit/LayoutTests/imagecapture/getphotocapabilities.html
index 8b654e037a0f4a0840fe64a3332b301789357ac4..e58930e6b465fff73c8917603f60fc89bb66db1f 100644
--- a/third_party/WebKit/LayoutTests/imagecapture/getphotocapabilities.html
+++ b/third_party/WebKit/LayoutTests/imagecapture/getphotocapabilities.html
@@ -26,8 +26,8 @@ async_test(function(t) {
     .then(mock => {
       mock_capabilities = mock.capabilities();
       return new ImageCapture(stream.getVideoTracks()[0]);
-    })
-    .catch(error => {
+    },
+    error => {
       assert_unreached("Error creating MockImageCapture: " + error);
     })
     .then(capturer => {
@@ -146,9 +146,9 @@ async_test(function(t) {
       t.done();
     })
     .catch(error => {
-      assert_unreached("Error during getPhotoCapabilities(): " + error);
+      assert_unreached("Error during getPhotoCapabilities(): " + error.message);
     });
 
-}, 'exercises the retrieval of Capabilities on ImageCapture API construction');
+}, 'exercises ImageCapture.getPhotoCapabilities()');
 
 </script>