Revert "Update the layer's alpha value upon composition of the layer"

This reverts commit 469fbaf6093daf7ac7a4339184f65c5729edd0b6.
Revert "Bring back the status bar activity indicators for mobile data and wifi"

This reverts commit 3f5309e5d2efdab066e62fdb9b0a4f887a9fd0dc.