Revert r229671 "aura: Allow creating content_shell without views."

http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win%20Builder%20%28deps%29/builds/74852/steps/compile/logs/stdio

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229683 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229683