Use list_dart_files.py instead of list_files.py in GN build.

Use list_dart_files.py instead of list_files.py in GN build.

To track https://codereview.chromium.org/2391863002/ on the
gyp side, and use it in more places.

R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/ee21a2261d68e3f2bcbccb204f50d921269c64d7

[zra, 2016-10-05 05:09:45]

Description was changed from

==========
Use list_dart_files.py instead of list_files.py in GN build.
==========

to

==========
Use list_dart_files.py instead of list_files.py in GN build.

To track https://codereview.chromium.org/2391863002/ on the
gyp side, and use it in more places.
==========

[zra, 2016-10-05 05:09:55]

zra@google.com changed reviewers:
+ johnmccutchan@google.com

[Cutch, 2016-10-05 13:53:22]

lgtm

[zra, 2016-10-05 14:50:43]

Description was changed from

==========
Use list_dart_files.py instead of list_files.py in GN build.

To track https://codereview.chromium.org/2391863002/ on the
gyp side, and use it in more places.
==========

to

==========
Use list_dart_files.py instead of list_files.py in GN build.

To track https://codereview.chromium.org/2391863002/ on the
gyp side, and use it in more places.

R=johnmccutchan@google.com

Committed:
https://github.com/dart-lang/sdk/commit/ee21a2261d68e3f2bcbccb204f50d921269c64d7
==========

[zra, 2016-10-05 14:50:44]

Committed patchset #1 (id:1) manually as
ee21a2261d68e3f2bcbccb204f50d921269c64d7 (presubmit successful).