tree 22d86bf5537483558aedd5ad25a9ca13886c83f9
parent 4a094de2903c511a8bdb4a91fb01de1faa1fd993
author Ian Hickson <ian@hixie.ch> 1540867476 -0700
committer GitHub <noreply@github.com> 1540867476 -0700
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Allow ChangeNotifier to be mixed in again (#23631)

Luckily this class didn't actually need to extend its superclass, it
only implements the interface. So we can change `extends` to
`implements` and that's close enough, while allowing the class to be
mixed in again.