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The clean toolbar buttons should have the same size and positioning
as the current toolbar.
This CL ensures this is happening.

Before: https://drive.google.com/file/d/1vorlHlUZvIZMV94iplEcPWdIPigV5Hgs/view
After: https://drive.google.com/file/d/1E1s8PKtyWILCvaO-fy8OX8-UJi_BoAK1/view

Bug: 791978
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie46f44c8eec3cb4fc194127d3092d8ea9328bd69
Reviewed-on: https://chromium-review.googlesource.com/809105
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522060}