Revert "Test for systemui lockup and excessive memory usage"

This reverts commit b27c02f876e38b5f3182d4999c8204d0d78ae376.
CM11 Themes: remove handleThemeConfigChanges

This was used by the T-Mobile theme chooser and is no longer
needed with the new chooser.

Change-Id: I035606ffe6cb3efc82a3a0ce79215509d8289503