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Evan Stade authoredUse of TransientWindowClient and ActivationClient allow the same implementation to work in both classic and Mash. Bug: 640365 Change-Id: I10324dce04bb014c09d04f45c0be6e691017a648 Reviewed-on: https://chromium-review.googlesource.com/c/1271403Reviewed-by: Scott Violet <sky@chromium.org> Reviewed-by: James Cook <jamescook@chromium.org> Commit-Queue: Evan Stade <estade@chromium.org> Cr-Commit-Position: refs/heads/master@{#600119} 27871aa8