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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

Review URL: http://codereview.chromium.org/10080014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132430 0039d316-1c4b-4281-b951-d872f2087c98