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When code was moved from browser.cc to browser_navigator.cc, the logic for
spawning popup windows was either mis-copied or copied from a different code
path; any browser of TYPE_APP (e.g. TYPE_APP_POPUP) should create popup windows
of TYPE_APP_POPUP.

BUG=chromium-os:11040
TEST=See issue + UI auto tests

Review URL: http://codereview.chromium.org/6296011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71876 0039d316-1c4b-4281-b951-d872f2087c98