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Since the locationBarContainer is expanded and its stackView is not, this CL creates a margin
constant and anchors the bottomAnchor to the toolbar bottomAnchor, this way the Y position of the
StackView is not changed during expansion or contraction.

Bug: 796482
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I69aac20beb0a2b3b31d516b78da7b1b4ba3a6ab8
Reviewed-on: https://chromium-review.googlesource.com/841442Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526016}