Bug 1275856 - Update expected outcomes of webplatform test for MediaRecorder. r=jib

With the addition of the MediaRecorderErrorEvent we are now compliant with the
spec in that regard. As such, the expected outcomes of the web platforms tests
can be updated to reflect that we should no longer expect failures for this
event.

MozReview-Commit-ID: 7yOVwbyMCHO

--HG--
extra : rebase_source : 4fdc9664fb5cd7f7e1bd912fd73506931e605588

testing/web-platform/meta/mediacapture-record/idlharness.html.ini

@@ -30,21 +30,3 @@
   [BlobEvent interface: attribute timecode]
     expected: FAIL
 
-  [MediaRecorderErrorEvent interface: existence and properties of interface object]
-    expected: FAIL
-
-  [MediaRecorderErrorEvent interface object length]
-    expected: FAIL
-
-  [MediaRecorderErrorEvent interface object name]
-    expected: FAIL
-
-  [MediaRecorderErrorEvent interface: existence and properties of interface prototype object]
-    expected: FAIL
-
-  [MediaRecorderErrorEvent interface: existence and properties of interface prototype object's "constructor" property]
-    expected: FAIL
-
-  [MediaRecorderErrorEvent interface: attribute error]
-    expected: FAIL
-