index: delay blob removal for 100 ms
index: delay blob removal for 100 ms

Work around a potential issue in older versions of Firefox where the
download URL might get culled too early.

Signed-off-by: Sean Cross <d7e19930cc1f42c2d0781f4d9e6f1fe5891bf9cf@xobs.io>

chibitronics/ltc-webview-layer,chibitronics/ltc-webview-layer,chibitronics/ltc-webview-layer,chibitronics/ltc-webview-layer