Revert of Port most uses of SkOnce to SkLazyPtr.

Revert of Port most uses of SkOnce to SkLazyPtr. (https://codereview.chromium.org/304383005/)

Reason for revert:
Leaking refs on SkTypeface on Macs.

Original issue's description:
> Port most uses of SkOnce to SkLazyPtr.
> 
> BUG=skia:
> 
> Committed: http://code.google.com/p/skia/source/detail?r=15006

TBR=reed@google.com,mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=15009

[mtklein, 2014-05-30 20:59:41]

Created Revert of Port most uses of SkOnce to SkLazyPtr.

[commit-bot: I haz the power, 2014-05-30 21:00:38]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@google.com/304283007/1

[commit-bot: I haz the power, 2014-05-30 21:00:57]

Change committed as 15009