Remove the author field from core/dom/events/README.md

It would be better to remove the author field.
See https://crrev.com/c/1322179 for the context.

TBR=tkent@chromium.org

Change-Id: Id97a9603b1cee3f31058e864ee3e0ff92c1d741e
Reviewed-on: https://chromium-review.googlesource.com/c/1325287Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606377}

third_party/blink/renderer/core/dom/events/README.md

@@ -2,8 +2,6 @@
 
 [Rendered](https://chromium.googlesource.com/chromium/src/+/master/third_party/blink/renderer/core/dom/events/README.md)
 
-Author: hayato@chromium.org
-
 The `renderer/core/dom/events` directory contains the implementation of [DOM Events].
 
 [DOM Events]: https://dom.spec.whatwg.org/#events