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This CL updates the Global Media Controls dialog to use 7 as the
minimum contrast ratio between the foreground and background colors
instead of using the default of 4.5.

Bug: 1049242
Change-Id: I81538040993cdd555cd1e6173554b9021018d18e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039894
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738688}