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The stack view button is only needed on iPhone. The iPad have the tab
switcher button.

Bug: 791456
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie2f0044d59218d27f8253b3b44bea1c5fbc7ef19
Reviewed-on: https://chromium-review.googlesource.com/808864Reviewed-by: Elodie Banel <lod@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522063}