5a8b0f3db When the instance method:init is unavailable, mark the class method:new unavailable. (flutter/engine#7532) (#26827)

https://github.com/flutter/engine/compare/898b4f8da4ef...5a8b0f3dba6a

git log 898b4f8da4efd905934d35cfc808932c80b26df0..5a8b0f3dba6a8627a90398f57511f8085b94fb61 --no-merges --oneline
5a8b0f3db When the instance method:init is unavailable, mark the class method:new unavailable. (flutter/engine#7532)

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