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. In aura, before a window is focused, ask the delegate if it can be focused.
. Make a popup RWHVA non-focusable.

This is to prevent the focus from moving from the main web-page to the combobox (which causes the combobox to get destroyed). This fixes an issue where comboboxes in the login screen could not be used properly.

BUG=105786
TEST=manually

Review URL: http://codereview.chromium.org/8770011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112909 0039d316-1c4b-4281-b951-d872f2087c98