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This CL adds a semantic color file which will be used across all ChromeOS
WebUIs such as System Web Apps and System Dialogs. As a strawman, some
top-level OS Settings styles have been replaced.

Bug: 1018654
Change-Id: Id06fe0a1ae6366e6e990c10f4ee004b330829b7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880358Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713346}