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This CL fixes a trivial bug in ToolbarButton, introduced by
crrev.com/696762.

Bug: 1002160
Change-Id: Ifaafe299203292bd80b7f9f25497604e59900c4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807473
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696864}