Right now, HTMLSourceElement and HTMLTrackElement's insertedInto and removedFrom contain obviously wrong code.
Fix them as I've learned these elements are only effective when they're a direct child of HTMLMediaElement.
Created attachment 324462 [details]
Attachment 324462 [details] did not pass style-queue:
ERROR: Source/WebCore/ChangeLog:8: You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible. [changelog/nonewtests] 
Total errors found: 1 in 3 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 324463 [details]
Wrote change log
Thanks for the review!
Committed r223801: <https://trac.webkit.org/changeset/223801>