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Previously, the button was not hooked up to anything. Now, clicking the
button results in a call to the MultiDeviceSetup service, which
completes the retry attempt.

Bug: 824568
Change-Id: I0de5ead024f63dda2cb3a26dfb07a987ab54b877
Reviewed-on: https://chromium-review.googlesource.com/1159202
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580413}