Revert 180901

Revert 180901
> Turn on aura again to get performance numbers. Will revert once perf release
> bots cycle.
> 
> R=ben@chromium.org
> TBR=ben@chromium.org
> BUG=none
> TEST=none
> 
> Review URL: https://codereview.chromium.org/12225037

TBR=sky@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=180902