ash/app_list: Dismiss app list when sys tray bubble shows.
ash/app_list: Dismiss app list when sys tray bubble shows.

App list is a bubble itself now and should be dimissed when system tray bubble
shows up.

BUG=none.
TEST=Bring up app list bubble then bring up system tray bubble. Verify that app list bubble closes.


Review URL: https://chromiumcodereview.appspot.com/10735062

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@146408 0039d316-1c4b-4281-b951-d872f2087c98

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