Oilpan: add missing Event-related USED_FROM_MULTIPLE_THREADS() decls.

Oilpan: add missing Event-related USED_FROM_MULTIPLE_THREADS() decls.

ErrorEvent and ProgressEvent are available in Worker contexts.

R=wibling@chromium.org
BUG=340522
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168141

[sof, 2014-02-28 11:37:33]

Please take a look.

[wibling-chromium, 2014-02-28 11:42:51]

lgtm

[sof, 2014-02-28 11:47:14]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-02-28 11:47:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/184413003/1

[haraken, 2014-02-28 12:02:48]

LGTM

[commit-bot: I haz the power, 2014-02-28 14:40:44]

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

[commit-bot: I haz the power, 2014-02-28 14:40:44]

Retried try job too often on win_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[sof, 2014-02-28 14:42:26]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-02-28 14:42:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/184413003/1

[commit-bot: I haz the power, 2014-02-28 15:57:24]

Change committed as 168141