Make Exception and Error objects ScriptWrappable.

Make Exception and Error objects ScriptWrappable.

This allows binding integrity checks to be applied to these objects.
Initially, I had skipped these because they are small, and in the case of
the exceptions, seemingly interrelated. So apply these as a group, so
we can take them out as a group if need be later on.

BUG=236671
R=abarth@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=150839

[Tom Sepez, 2013-05-21 20:24:54]

Adam. Please review.

[abarth-chromium, 2013-05-21 20:29:19]

lgtm

[commit-bot: I haz the power, 2013-05-21 21:13:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tsepez@chromium.org/15605003/1

[commit-bot: I haz the power, 2013-05-21 23:51:07]

Change committed as 150839