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It should not be possible to minimize transient dialog windows.
These windows typically disable input for the parent and minimizing
them and leaving the parent in a disabled state can be very confusing.

Bug: 821498
Test: exo_unittest --gtest_filter=ShellSurface.Minimum
Change-Id: I288b57a4b36f61d6ae0d491796ba45d8c9e44686
Reviewed-on: https://chromium-review.googlesource.com/1027890
Commit-Queue: David Reveman <reveman@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553523}