Revert 229521 "Revert 229507 "aura: Allow creating content_shell..."

Revert 229521 "Revert 229507 "aura: Allow creating content_shell..."

Revert didn't help, so reland the change.

> Revert 229507 "aura: Allow creating content_shell without views."
> 
> Speculative. All windows bots on the main waterfall except for the clobber
> builder started timing out during compile during a window that had only this
> change and two test-only changes in the range.
> 
> > aura: Allow creating content_shell without views.
> > 
> > This builds content_shell with use_aura=1 and toolkit_views=0.
> > 
> > BUG=none
> > R=derat@chromium.org, jamescook@chromium.org, jochen@chromium.org
> > 
> > Review URL: https://codereview.chromium.org/26695007
> 
> TBR=sadrul@chromium.org
> 
> Review URL: https://codereview.chromium.org/30413002

TBR=thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=229524

[Nico, 2013-10-19 06:47:48]

Committed patchset #1 manually as r229524.