Revert 173997

Revert 173997
> Adds app_list and message_center to aura_builder
> 
> BUG=166730
> TEST=GYP_DEFINES='chromeos=1' ./build/gyp_chromium && ninja aura_builder succeeds
> 
> Review URL: https://codereview.chromium.org/11640004

TBR=mukai@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=174007