Cancel uninstall if the uninstall dialog's parent window is destroyed prior to
the uninstall dialog showing.

BUG=424999, 397396
TEST=ExtensionUninstallDialogViewBrowserTest.TrackParentWindowDestruction

Review URL: https://codereview.chromium.org/697023002

Cr-Commit-Position: refs/heads/master@{#302691}
6 files changed