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Notificaiton center now fires a focus event on a view that has no role (i.e. a client node). Allow for this so that we pick up on the window ax obj's name "notification center" and override client output to be $name (avoiding the role which provides no value).

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
BUG=643995
TEST=alt+shift+n

Review-Url: https://codereview.chromium.org/2383103003
Cr-Commit-Position: refs/heads/master@{#422607}