Erasure fix: Replace type parameters with dynamic instead of Object.
Erasure fix: Replace type parameters with dynamic instead of Object.

Using Object causes issues in function types.

This fixes an issue for running delta-blue in AOT strong mode.

BUG=
R=kmillikin@google.com

Review URL: https://codereview.chromium.org/2492453002 .

dart-archive/kernel,dart-lang/kernel