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This CL increases specificity of dark mode CSS for a folder that has
a drag over it to force the CSS to override other colors.

Fixed: 1139798
Change-Id: I6bda5834d06e9d3a4ebd27aea468df3c44a42512
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490680Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819630}