Remove use of SK_SUPPORT_LEGACY_LAYERRASTERIZER_API.

Remove use of SK_SUPPORT_LEGACY_LAYERRASTERIZER_API.

Mozilla have removed any uses of the legacy API from their Moz2D code.
Since they were the last users we know of, we can remove the legacy API.

BUG=skia:2187
Committed: https://skia.googlesource.com/skia/+/1bd6f7de5273f56a361a5b29ac9b448a525f0b9b

[Dominik Grewe, 2014-07-17 10:38:06]

ptal, thanks!

[scroggo, 2014-07-17 13:17:53]

lgtm

[scroggo, 2014-07-17 13:18:36]

On 2014/07/17 13:17:53, scroggo wrote:
> lgtm

nit: Message should say:

BUG=skia:2187

[reed1, 2014-07-17 13:18:37]

lgtm

[reed1, 2014-07-17 13:19:07]

The CQ bit was unchecked by reed@google.com

[reed1, 2014-07-17 13:19:12]

The CQ bit was checked by reed@google.com

[reed1, 2014-07-17 13:19:19]

The CQ bit was unchecked by reed@google.com

[reed1, 2014-07-17 13:19:31]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2014-07-17 13:20:33]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/dominikg@chromium.org/402613003/1

[commit-bot: I haz the power, 2014-07-19 01:21:04]

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

[commit-bot: I haz the power, 2014-07-19 01:21:05]

Exceeded time limit waiting for builds to trigger.

[Dominik Grewe, 2014-07-21 09:39:14]

The CQ bit was checked by dominikg@chromium.org

[commit-bot: I haz the power, 2014-07-21 09:39:29]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/dominikg@chromium.org/402613003/1

[commit-bot: I haz the power, 2014-07-21 09:43:25]

Change committed as 1bd6f7de5273f56a361a5b29ac9b448a525f0b9b