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This CL moves the centralized style sheet to ui/chromeos/colors since it's
being used for Views as well as WebUI.

A new chrome://resources alias was added so the file can be accessed
through chrome://resources/chromeos/colors/cros_colors.generated.css.

Bug: 1018654
Change-Id: If7fb5c0aed3fa30746df32587e818a4f420ba49c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306140Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792186}