Remove attempted bug mitigation in Mac typeface.

Remove attempted bug mitigation in Mac typeface.

An attempt was made to hold onto the 'sbix' table when it existed
when drawing to mitigate an issue with vanishing font data. This
code has not affected the crash rate, so remove it.

Committed: https://skia.googlesource.com/skia/+/1b5f25c5d75f4a992ce3eff1d12afa775f580954

[bungeman-skia, 2015-06-08 19:33:53]

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

[commit-bot: I haz the power, 2015-06-08 19:34:06]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1168793003/1

[bungeman-skia, 2015-06-08 19:36:26]

bungeman@google.com changed reviewers:
+ reed@google.com

[bungeman-skia, 2015-06-08 19:36:26]

To offset the changes in https://codereview.chromium.org/1163573007/ , remove
the old attempt at working around this issue.

[commit-bot: I haz the power, 2015-06-08 19:39:09]

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

[commit-bot: I haz the power, 2015-06-08 19:39:11]

Dry run: This issue passed the CQ dry run.

[bungeman-skia, 2015-06-08 20:34:06]

bungeman@google.com changed reviewers:
+ mtklein@google.com

[bungeman-skia, 2015-06-08 20:34:07]

Remove all the useless code!!!

[reed1, 2015-06-08 21:17:25]

lgtm

[mtklein, 2015-06-08 21:31:24]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-06-08 21:31:24]

lgtm

[commit-bot: I haz the power, 2015-06-08 21:31:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1168793003/1

[commit-bot: I haz the power, 2015-06-08 21:32:30]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/1b5f25c5d75f4a992ce3eff1d12afa775f580954