[InstantStart] Closes all tabs should hide tab switcher.
This bug is caused by the StartSurfaceMediator registers an observer to the empty tab model before the TabModel is initialized. In this CL, we register an observer to the TabModeSelector first and registers an normal TabModel observer after the TabModel is initialized. Bug: 1126914, 1138162 Change-Id: I653aeac99c58ed032e9a604b4001a389832d3452 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517623 Commit-Queue: Xi Han <hanxi@chromium.org> Reviewed-by:Yue Zhang <yuezhanggg@chromium.org> Cr-Commit-Position: refs/heads/master@{#825345}
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