Remove isScrolledToBottom from Element's prototype
Remove isScrolledToBottom from Element's prototype

All usages have been removed.

Bug: chromium:1135143, chromium:1011811
Change-Id: I838c266eddf527396122e6991f82871cf4200acd
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2450032
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>

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