Fix toV8 and ExceptionState with empty context.

Fix toV8 and ExceptionState with empty context.

BUG=369451
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175120

[tasak, 2014-05-30 05:00:22]

Would you review this CL?

[haraken, 2014-05-30 05:04:28]

LGTM

[tasak, 2014-05-30 06:35:32]

The CQ bit was checked by tasak@google.com

[commit-bot: I haz the power, 2014-05-30 06:38:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tasak@google.com/303363002/1

[commit-bot: I haz the power, 2014-05-30 09:45:45]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/9566)

[commit-bot: I haz the power, 2014-05-30 10:16:11]

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

[commit-bot: I haz the power, 2014-05-30 10:16:11]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/9583)

[tasak, 2014-05-30 10:43:04]

The CQ bit was checked by tasak@google.com

[commit-bot: I haz the power, 2014-05-30 10:43:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tasak@google.com/303363002/1

[commit-bot: I haz the power, 2014-05-30 13:00:51]

Change committed as 175120