IDL parser: override Attribute production from base IDL parser

IDL parser: override Attribute production from base IDL parser

The Attribute production is deprecated in the base IDL parser and is kept
around only because Blink references it.

It would be better to name this production ExceptionAttribute, but doing
that now leaves the Attribute production in the base parser unused, which
causes warnings. Overriding it here will let us remove it from the base
parser without fuzz.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186957

[Jens Widell, 2014-12-11 14:10:34]

jl@opera.com changed reviewers:
+ haraken@chromium.org

[Jens Widell, 2014-12-11 14:10:35]

PTAL

This is just a step in aligning the base parser's grammar to the spec. The
output from the parser doesn't change.

[haraken, 2014-12-11 14:23:21]

LGTM

[Jens Widell, 2014-12-11 14:23:49]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2014-12-11 14:24:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/793343002/1

[commit-bot: I haz the power, 2014-12-11 15:39:12]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=186957