Fix scrollbar issue in CodeMirror console input field
Fix scrollbar issue in CodeMirror console input field

We were already hiding the scrollbar, but the latest version of
CodeMirror uses inline styles to set the `display` of the element.
Therefore, our override wouldn't work. We can (unfortunately) use
the `!important` fix to remove the scrollbar once again.

R=993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org,aerotwist@chromium.org

Fixed: 1093786
Change-Id: Ibb8f581468c60dcd198c62bd001f04dd29676bfa
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2241753
Auto-Submit: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

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