Delete dead subset test code from dm

Delete dead subset test code from dm

This approach to subset decoding is no longer supported.
We have replaced it with an implementation that does not
depend on forked libraries.
https://codereview.chromium.org/1406153015/

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/164d302ebf182a2db0044ba46126f9ed1e6cf138

[msarett, 2015-11-10 16:31:15]

msarett@google.com changed reviewers:
+ scroggo@google.com

[msarett, 2015-11-10 16:32:33]

Description was changed from

==========
Delete dead subset test code from dm

This approach to subset decoding is no longer supported.
https://codereview.chromium.org/1406153015/

BUG=skia:
==========

to

==========
Delete dead subset test code from dm

This approach to subset decoding is no longer supported.
We have replaced it with an implementation that does not
depend on forked libraries.
https://codereview.chromium.org/1406153015/

BUG=skia:
==========

[scroggo, 2015-11-10 18:54:24]

lgtm

[msarett, 2015-11-10 22:57:50]

The CQ bit was checked by msarett@google.com

[commit-bot: I haz the power, 2015-11-10 22:57:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416673010/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416673010/20001

[commit-bot: I haz the power, 2015-11-10 23:09:07]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/164d302ebf182a2db0044ba46126f9ed1e6cf138