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Currently, the uninstall/app info dialog is not being hidden when overview mode
is toggled while in tablet (home launcher) mode.

TEST=manual + unit test
BUG=991140

Change-Id: I7fd95a14e1b74f244f57834cbffd145e59624c20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775384Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695877}