Remove backward compatibility check in inspector_overlay
Remove backward compatibility check in inspector_overlay

Bug: none
Change-Id: I26e8bb3bbe66b0271606fcc3e6d050212fd84b04
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2681738
Commit-Queue: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>
Reviewed-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

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