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This CL preemptively fixes closure annotations for all NUX-related JS
files, there will be a follow-up CL to actually enable closure compiling
on these files.

Bug: 874151
Change-Id: I67d56d7b0cffc2c8fa8134c03bf748eaaf79c376
Reviewed-on: https://chromium-review.googlesource.com/1256362
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595707}