Fix a bug in IDL parsing related to arrays of callbacks.

Fix a bug in IDL parsing related to arrays of callbacks.

Also rename the 'refs' parameter to 'callbacks' to make the code a little bit
more clear, since 'refs' was only used to store callback information.

Matt noticed this bug after I landed 
https://chromiumcodereview.appspot.com/10054039/

It turns out the the rest of the JSON compiler infrastructure doesn't actually
support arrays of functions, but at least the IDL will generate the right JSON
in this case. 

BUG=none
TEST=included unit test should pass

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=132430

[miket_OOO, 2012-04-13 21:04:32]

lgtm

[commit-bot: I haz the power, 2012-04-13 21:05:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asargent@chromium.org/10080014/1001

[commit-bot: I haz the power, 2012-04-13 22:37:43]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[commit-bot: I haz the power, 2012-04-13 22:48:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asargent@chromium.org/10080014/1001

[commit-bot: I haz the power, 2012-04-14 00:46:12]

Try job failure for 10080014-1001 (retry) on mac_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2012-04-16 16:40:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asargent@chromium.org/10080014/1001

[commit-bot: I haz the power, 2012-04-16 18:16:16]

Change committed as 132430