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Fix the selector to be able to reach to <button> or <cr-button> in the
toolbar.

Bug: 1035691
Change-Id: I75ddda33c00914c049d048209e1d21cf761b4758
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094063
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748135}