Revert of SSE2 everywhere.

Revert of SSE2 everywhere. (https://codereview.chromium.org/294963002/)

Reason for revert:
Making GM run fewer tests than expected?

Original issue's description:
> SSE2 everywhere.
> 
> As of M35, Chrome will require SSE2 on Linux (it already did on Windows, and
> requires SSSE3 on Macs).  Android already requires SSE2 for x86 chips.
> 
> This effectively just forces it on for 32-bit Linux builds; everyone else already had it.
> 
> BUG=skia:
> 
> Committed: http://code.google.com/p/skia/source/detail?r=14800

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

Committed: http://code.google.com/p/skia/source/detail?r=14803

[mtklein, 2014-05-20 15:26:58]

Created Revert of SSE2 everywhere.

[commit-bot: I haz the power, 2014-05-20 15:27:11]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@google.com/282093015/1

[commit-bot: I haz the power, 2014-05-20 15:27:39]

Change committed as 14803