Reset inkdrop effect when host gets removed.

Fixes bug where the inkdrop hover effect remains active after a dialog
OK button is reset + moved (no mouse exit event is triggered). Found
when refactoring password promo dialogs to replace existing dialog
content.

Bug: chromium:654115
Change-Id: If9dd3619292706fd332ff905e6e89bbe2266d9c2
Reviewed-on: https://chromium-review.googlesource.com/875310
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531458}
4 files changed