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The problem was that the UI expected that CONTEXT_KEY_KEYBOARD_STATE key
observer is called before CONTEXT_KEY_KEYBOARD_PINCODE observer. In fact, the
order of notifications was never defined. It have changed at some point, which
lead to regression.

BUG=507896
TEST=OobeWebUITest.HIDDetectionScreenTest browser test

Review URL: https://codereview.chromium.org/1243983002

Cr-Commit-Position: refs/heads/master@{#339767}