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Given events a_1, .., a_n that come in in the same update,
where a_i is a blur and a_j is focus (i < j).

Then, a_i's update params focused id will point to a_j's node.

As a result, we never actually fire a_j properly since it was seen as "already" focused.

TEST=navigate context menus in files app.
BUG=668775

Review-Url: https://codereview.chromium.org/2575233002
Cr-Commit-Position: refs/heads/master@{#439116}