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Just use RenderText's cap-height vertical centering.
Do not use one-off naive font-height vertical centering.

BUG=411908
TEST=views::Label and gfx::Canvas::DrawString* text baselines look good and match Textfields.
R=sky@chromium.org

Review URL: https://codereview.chromium.org/585053002

Cr-Commit-Position: refs/heads/master@{#296008}