Revert "Temporarily turn on callstack logging"

Bug: 13927881

'twas useful and perhaps should be always enabled (please?)
but not like this, so reverting.

This reverts commit db4488565a791fc769b0b0b6ca4a0689eb3d5f4e.

Change-Id: I9a78c6d6e48342ef6ca1f2f7b5303ca47ccc6086
1 file changed