Purge non-NEON ARM code.

Purge non-NEON ARM code.

As I begin to wade in here, it's nice to remove as much code as possible.

BUG=skia:4117
Committed: https://skia.googlesource.com/skia/+/e683e810a35e4ea91b00104590e15a56cb35ad39

[mtklein_C, 2015-08-06 18:03:52]

The CQ bit was checked by mtklein@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-06 18:04:09]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1277953002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1277953002/1

[mtklein_C, 2015-08-06 18:09:26]

mtklein@chromium.org changed reviewers:
+ djsollen@google.com

[commit-bot: I haz the power, 2015-08-06 18:11:02]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-06 18:11:03]

Dry run: This issue passed the CQ dry run.

[djsollen, 2015-08-06 18:17:16]

lgtm

[mtklein, 2015-08-06 18:18:12]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-08-06 18:18:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1277953002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1277953002/1

[commit-bot: I haz the power, 2015-08-06 18:18:53]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/e683e810a35e4ea91b00104590e15a56cb35ad39