Windows: Switch to aura/views architecture for content window creation (issue #180).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1542 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Fix crash when browser window creation is canceled (issue #1147).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1543 5089003a-bbd8-11dd-ad1f-f1f9622dbc98