Update mocks

Author: AudricV

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/stream/YoutubeStreamExtractorAgeRestrictedTest.java

@@ -54,8 +54,6 @@ public static void setUp() throws Exception {
     @Override public long expectedDislikeCountAtLeast() { return 38000; }
     @Override public boolean expectedHasRelatedItems() { return false; } // no related videos (!)
     @Override public int expectedAgeLimit() { return 18; }
-    // Broken, video is available with the embedded player
-    // @Nullable @Override public String expectedErrorMessage() { return "Sign in to confirm your age"; }
     @Override public boolean expectedHasSubtitles() { return false; }
 
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