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Currently, window.event is implemented as a private symbol property
stored on the Window JavaScript object itself. While doing so may have
simplified memory management when the code was first written versus
storing the event in C++, it does not anymore with Oilpan and unified
heap. This also has no performance benefits, since each call to event()
has had to jump through multiple C++/JS boundaries.

The custom setter for Window.event was previous removed in r538391. This
CL removes the custom getter.

Bug: 236420
Change-Id: I67e862dda8c5a0248436ea90553fbf0b9b37aca9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225505
Commit-Queue: Timothy Gu <timothygu@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774170}