Revert "Update onOverviewShown interface to get signal of whethe..."

Revert submission 20956764-alt_tab_forward

Reason for revert: Actually we dont need these changes after all. SHIFT doesn't matter in the initial tab to overview. The subsequent tabs are handled by RecentsView and we already have a check on shift

Reverted changes: /q/submissionid:20956764-alt_tab_forward

Change-Id: I42b03d10f30ef137c98005bb46e23f8516720236
1 file changed