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This CL consolidates individual "font-size:13px"s and "line-height:20px"s into a
global rule.

Bug: 741877
Change-Id: Ica1d1498f7f7c7ad11df8f522dd22984230c0f73
Reviewed-on: https://chromium-review.googlesource.com/574672Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487370}