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Format mojom_js_generator.py

In preparation for upcoming changes, this applies the repo's python
auto-formatting to the entire mojom_js_generator.py file to avoid extra
noise alongside more meaningful changes.

Bug: 1004256
Change-Id: I227d689b4eff4ee2a5f51bba068490f282151cba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450585
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Auto-Submit: Ken Rockot <rockot@google.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813972}