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The types.js file now just contains typedefs for Closure.
There are some constants defined in events.js which are actually used at runtime.

Change-Id: Ibe12b78de463785e1a27f613ff6cad54facaa90d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626614Reviewed-by: John Palmer <jopalmer@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Kenton Lam <kentonlam@google.com>
Cr-Commit-Position: refs/heads/master@{#843389}