Revert of Disable app banners (https://chromiumcodereview.appspot.com/
226653002/)
Reason for revert:
Reverting to turn them back on.
Original issue's description:
> Disable app banners
>
> It has been Decided that the UX mocks should be revisited.
> Disabling on trunk to merge backward to M35.
>
> BUG=360162
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261934
TBR=thakis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=360162
Review URL: https://codereview.chromium.org/
227083009
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262264 0039d316-1c4b-4281-b951-d872f2087c98