Revert "Allow custom density setting"

This is not the correct way to implement density scaling. It breaks
compatibility with old applications. We can leverage WindowManager's
density functions to provide this functionality without breaking
anything.

This reverts commits 7f1bf5c5 and
1dfc43a0.

Change-Id: Ief7151e67ea6275239f4f82280bf7421c9b4f142