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This was a regression caused by crrev.com/c/1326621, which
showed/hid the root window on Restore/Minimize. In turn this caused
DesktopNativeWidgetAura::IsVisible() to return false for minimized
widgets, because |content_window_| was not visible. Fix is to
use TargetVisibility() instead of IsVisible().

Bug: 813093, 927489
Change-Id: I7cb97ccae6452320ee4a906875535f618e1ab013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1406069Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638715}