Use _nextLink instead of _next for better type inferencing.

Use _nextLink instead of _next for better type inferencing.

This recovers ~400 of the ~1400 byte regression on r44451.

The _next field was inferred as  Union of [[null|exact=LinkedHashSetCell], [null|subclass=_DoubleLink]]

Another way to fix this issue would be to make queue.dart a sub-library.

R=lrn@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44508

[sra1, 2015-03-16 12:49:57]

sra@google.com changed reviewers:
+ lrn@google.com

[Lasse Reichstein Nielsen, 2015-03-16 14:07:49]

lgtm

[sra1, 2015-03-16 15:11:32]

Committed patchset #1 (id:1) manually as 44508 (presubmit successful).