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Currently the chrome-extension scheme is treated as 'insecure' in
cast_shell, and that makes service worker unavailable in cast_shell.
Add chrome-extension scheme to secure_schemes to solve this.

Bug: internal b/111359399
Test: check window.isSecureContext is true
Change-Id: Ic1d68ceac3b522f2c0140910d53e664fd9ff895d
Reviewed-on: https://chromium-review.googlesource.com/c/1308914
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604349}