Revert "Avoid multiple dns lookups for the same query"

This is causing issues with the notification drawer, and at least an
issue with BetterBatteryStats getting stuck on "Computing". I suspect
it might be causing other weird issues as well.

For a description of the notification drawer issue, refer to issue 6040
in the issue tracker: http://kan.gd/1qlb

Screenshot of the issue: http://i46.tinypic.com/24g9lhy.png

This reverts commit f3a96b95d3d48f7d8b8a622858942f9c8c530221.

Change-Id: I41c55e1fead7eb2e47d74095c15cd1685b3337fe