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When a remote client creates a window, the remote client should control when it
is closed. This makes it to so that when the user attemps to close a window
created by a remote client, the remote client is asked to close the window.

BUG=842298
TEST=covered by test

Change-Id: I9ace655c0648fc0f8943425c67fb57e088ef00fa
Reviewed-on: https://chromium-review.googlesource.com/1087870
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564897}