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This allows clients to restore the original host desktop size when the relevant
option is unchecked, rather than only on disconnect.

Change-Id: Ia344223bb1475c3b60fbbdd0510f20be8694203d
Reviewed-on: https://chromium-review.googlesource.com/1058675
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560800}