Remove "GLContex: GLContextCGL::SetSwapInterval is ignored" spam

Remove "GLContex: GLContextCGL::SetSwapInterval is ignored" spam

This message fills up about:gpu and stdout, and doesn't provide any
value.

BUG=

Committed: https://crrev.com/ccfba6716ad0f273bf91d7bf34641b24968f9c78
Cr-Commit-Position: refs/heads/master@{#299169}

[ccameron, 2014-10-10 18:59:31]

ccameron@chromium.org changed reviewers:
+ sievers@chromium.org

[ccameron, 2014-10-10 18:59:31]

This was bothering me.

[no sievers, 2014-10-10 19:02:21]

lgtm

[ccameron, 2014-10-10 19:02:51]

Thanks!

[ccameron, 2014-10-10 19:02:55]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-10-10 19:04:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/645143002/1

[commit-bot: I haz the power, 2014-10-10 19:59:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-10 20:00:16]

Patchset 1 (id:??) landed as
https://crrev.com/ccfba6716ad0f273bf91d7bf34641b24968f9c78
Cr-Commit-Position: refs/heads/master@{#299169}