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Actually, all WebKit cares about is if callback threw an exception or not. So return type of callbacks should be actually ignored. As of now it is always bool for WebKit IDLs, but sometimes it gets overridden to void by supplemental IDLs. R=podivilov@chromium.org BUG=3016 Review URL: https://codereview.chromium.org//10908284 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12440 260f80e4-7a28-3924-810f-c04153c831b5