Viren Khatri fd3b605c70 Deprecates hashValues and hashList (flutter/engine#30674)
* deprecate hashValues and hashList

* rm unused imports

* missing periods and const lists

* improves hashing of lists

* ignore: avoid_classes_with_only_static_members

* migrate new classes

* refactor: update version of deprecation
2022-05-31 21:19:57 +05:30
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