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Fix crash when closing a constrained window in win aura. The crash happens because the aura::Window for the constrained window is removing itself from its parent window, and its parent_ pointer is already NULL'd before the focus manager is retrieved which fails because aura::client::GetFocusClient can't get to a root window. See the bug for the callstack.

BUG=174727
Review URL: https://codereview.chromium.org/12226102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@181947 0039d316-1c4b-4281-b951-d872f2087c98