[cleanup] Remove explicit any usage in OverlayModel.ts
[cleanup] Remove explicit any usage in OverlayModel.ts

R=dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org

Bug: 1172300
Change-Id: Iee2e41e960e235b6ef8cf7bdbc2bce67577402be
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3334542
Auto-Submit: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>
Reviewed-by: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

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