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The last line of sytled_label does not have enough space for customized
line height. This patch fixes this bug.

Bug: b/114129692
Test: StyledLabelTest.LineHeight
Change-Id: I2a218b244983043d9f23d413fe33acefb5ac890f
Reviewed-on: https://chromium-review.googlesource.com/1217068
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590450}