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Web IDL spec allows to use '{}' as a default value for dictionaries,
to mean an empty dictionary.
This CL makes IDL compiler follows the spec.


Bug: 984949
Change-Id: I9979f590cfc7f17c2aeff50f9333f23f7baf87a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824758Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699667}