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This CL removes the code used only by the old UI in the Toolbar
Button Factory.
In order to keep compilation intact, the methods are emptied, they are
not removed.

Bug: 800266
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id74766e69c9f06a7e44fa2c669789a4bc9822675
Reviewed-on: https://chromium-review.googlesource.com/1230677Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592713}