Reland "[cleanup] Remove old things from front_end/devtools_compatibility.js"

This is a reland of commit fe727c6,
with things remove that are marked older or equal to M60.

Original change's description:
> [cleanup] Remove old things from front_end/devtools_compatibility.js
>
> Remove functions that are not on the interface and code that is mark with very old Major.
>
> Bug: 454321652
> Change-Id: I6378632d0c99c932336ae0b4d3231b6f5857ebd6
> Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7073653
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Commit-Queue: Nikolay Vitkov <nvitkov@chromium.org>
> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
> Auto-Submit: Nikolay Vitkov <nvitkov@chromium.org>

Bug: 454321652
Change-Id: I5827b4cb4207da62f411e417ce997927db7591a9
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7079117
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Nikolay Vitkov <nvitkov@chromium.org>

Author: Lightning00Blade