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I suspect that host.options was originally a simple dictionary, and so the cast was safe. When it got upgraded to an object with methods on the prototype it broke, but because the window of opportunity for failure is small (you have to connect without a call to HostList.refresh happening in the interim), it was difficult to track down.

BUG=680302

Review-Url: https://codereview.chromium.org/2621403004
Cr-Commit-Position: refs/heads/master@{#443072}