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We need to do this in order to associate resynthesized GenericFunctionTypeElementImpl instances with these enclosing ElementImpl instances. The same enclosing ElementImpl can also be used to get the TypeParameterizedElementMixin for accessing type parameters. R=brianwilkerson@google.com, paulberry@google.com BUG= Review-Url: https://codereview.chromium.org/2813543007 .