fix for #520, ListMixin should work again

fix for #520, ListMixin should work again
it regressed when dart:html was added and it became an "extension type"

R=vsm@google.com

Committed: https://github.com/dart-lang/dev_compiler/commit/2b594db0bcbb1b0c0a44e573e2f6927095543899

[Jennifer Messerly, 2016-05-04 20:55:17]

jmesserly@google.com changed reviewers:
+ vsm@google.com

[Jennifer Messerly, 2016-05-04 20:58:08]

https://codereview.chromium.org/1949163003/diff/1/test/browser/language_tests.js
File test/browser/language_tests.js (right):

https://codereview.chromium.org/1949163003/diff/1/test/browser/language_tests...
test/browser/language_tests.js:442: 'string_fromcharcodes_test': skip_fail, //
timeouts
will change to: skip_timeout

(just noticed it)

[vsm, 2016-05-04 21:20:24]

lgtm

[Jennifer Messerly, 2016-05-04 21:31:33]

Description was changed from

==========
fix for #520, ListMixin should work again
it regressed when dart:html was added and it became an "extension type"
==========

to

==========
fix for #520, ListMixin should work again
it regressed when dart:html was added and it became an "extension type"

R=vsm@google.com

Committed:
https://github.com/dart-lang/dev_compiler/commit/2b594db0bcbb1b0c0a44e573e2f6...
==========

[Jennifer Messerly, 2016-05-04 21:31:34]

Committed patchset #2 (id:20001) manually as
2b594db0bcbb1b0c0a44e573e2f6927095543899 (presubmit successful).