Fix a strong mode problem in _NativeSocket.
Fix a strong mode problem in _NativeSocket.

The response returned by _IOService._dispatch has type `dynamic`, so
type inference can't infer the generic type parameter for
response.skip(1).map.  This leads to the map operation producing an
Iterable<dynamic>, which in turn causes _NativeSocket.lookup() to
return a List<dynamic>, which violates its interface.  (Its interface
guarantees it will return a List<InternetAddress>.)

The easiest solution is to supply a type argument to `map`.

This should fix some failures on the VM kernel debug bots.

Change-Id: I61b5b344b56080d9065a902700bb313139c422da
Reviewed-on: https://dart-review.googlesource.com/18880
Commit-Queue: Paul Berry <72d414e3a99fb120308437779d51667bcc0984eb@google.com>
Reviewed-by: Sigmund Cherem <beaea8fd7d2a56555046ba4f362c8a93e3938576@google.com>

dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk