Remove overly-promiscuous SkNx syntax sugar.

Remove overly-promiscuous SkNx syntax sugar.

I haven't figured out a pithy way to have these apply to only classes
originating from SkNx, so let's just remove them.  There aren't too
many use cases, and it's not really any less readable without them.

Semantically, this is a no-op.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/f2fe0e03205c4d7f70496ec8c6bea9a82ae88329

[mtklein_C, 2015-06-08 18:20:09]

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

[mtklein_C, 2015-06-08 18:20:16]

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

[commit-bot: I haz the power, 2015-06-08 18:20:41]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167153002/1

[commit-bot: I haz the power, 2015-06-08 18:22:48]

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

[commit-bot: I haz the power, 2015-06-08 18:22:49]

Dry run: Try jobs failed on following builders:
  Build-Mac10.8-Clang-x86_64-Release-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Mac10.8-Clang-...)

[mtklein, 2015-06-08 18:27:13]

The CQ bit was checked by mtklein@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-06-08 18:27:37]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167153002/20001

[commit-bot: I haz the power, 2015-06-08 19:14:46]

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

[commit-bot: I haz the power, 2015-06-08 19:14:48]

Dry run: This issue passed the CQ dry run.

[bsalomon, 2015-06-10 15:39:20]

lgtm, thanks!

[mtklein, 2015-06-10 15:47:10]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-06-10 15:47:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167153002/20001

[commit-bot: I haz the power, 2015-06-10 15:53:44]

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

[commit-bot: I haz the power, 2015-06-10 15:53:45]

Internal error: failed to checkout. Please try again.

[mtklein, 2015-06-10 15:56:40]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-06-10 15:56:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167153002/20001

[commit-bot: I haz the power, 2015-06-10 15:57:31]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/f2fe0e03205c4d7f70496ec8c6bea9a82ae88329