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fuchsia: FIDL JS: format gen.py with yapf --style=chromium

Also, don't import * from fidl to avoid pylint complaining on Gerrit.

With a couple tweaks to avoid 80col being exceeded for presubmit. No
intended functionality change (and the generated fidl.js is unchanged).

Bug: 883496
Change-Id: If4335f92d7630dd4b543dc686d2baf6aca5d2b6e
Reviewed-on: https://chromium-review.googlesource.com/c/1258087
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600562}