Victor Berchet 3bcc0e6f76 refactor(core): refactor WrappedValue (#20997)
- Improve `WrappedValue` by adding `unwrap` symetrical to `wrap`.
- remove dead code - `ValueUnwrapper`

The property `wrapped` is an implementation details and should never be accessed
directly - use `unwrap(wrappedValue)`. Will change to protected in Angular 7.

PR Close #20997
2018-01-16 07:12:58 -08:00
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