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This change adds a confirmation dialog for the It2Me Linux host.  This
dialog will be displayed when an incoming It2Me connection and will wait
up to 60 seconds for the user to accept/reject it.  If the user accepts
the connection then we will complete the conneciton process, otherwise
the incoming request will be rejected.

BUG=645540

Review-Url: https://codereview.chromium.org/2343443002
Cr-Commit-Position: refs/heads/master@{#418611}