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The mixin was only being used on the Extensions page; all other uses
just use the --cr-primary-text-color variable. The line-height of 154%
is already set on the body element of the Extensions page [1] so it
does not need to be added.

https://imgur.com/a/XsOb3jC

[1] https://cs.chromium.org/chromium/src/chrome/browser/resources/extensions/extensions.html?type=cs&q=extensions.html&sq=package:chromium&g=0&l=52

Bug: 973674
Change-Id: I7c4f5d22ae6d1a77227247cc5abf654246815f18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703093Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678039}