077357ccf0
Before, the back button had different behavior depending on which part of the search dialog had focus, and depending on whether there were more suggestions than could fit in the visible space in the drop-down. This change makes the behavior of the BACK button more predictable, by always going back to QSB when pivoted into a source, and closing the search dialog when in QSB. Fixes http://b/issue?id=2126526 "One tap of back button when entering text to search should always take you back to previous page" Change-Id: I7b3553122eaa1a5d87ac966d5ab2a9f432063cc9