Revert "Bring back the status bar activity indicators for mobile data and wifi"

This reverts commit 69f39661d63f920e6d1b65428b175b064925b910.

Change-Id: I6d9bc8331a074655e89f7201332822d19909d6ca
Revert "Squashed commit of the theme engine support."

Anecdotal testing shows app responsiveness to be much better
and overall more CPU idle time (and presumably better battery life).

This reverts commit cbdc805a9b4715d3d6f47e2b4de9e7de49569a4e.

Change-Id: I581c993ea8f43667e2c676fd408aafd7f3485f71