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This change uses the -internal-light-dark-color css property to set
correct dark mode styling on the button native controls.

Bug: 929098
Change-Id: I15e68cda2a07bb89601c43ef1dc8ce696c75b1ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097318Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Ionel Popescu <iopopesc@microsoft.com>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Sam Sebree <sasebree@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#751364}