b62276d97f
This migrates the JS builtin's string type to the `<T>` type parameter for a few more cases. This was done to eliminate null checks, casts and dynamic calls when dartdevk builds the SDK, so it matches dartdevc. Change-Id: I8570e5127149a45289a90002c27034333c3038ad Reviewed-on: https://dart-review.googlesource.com/51207 Reviewed-by: Leaf Petersen <leafp@google.com>