Remove unnecessary setNeedsRecalcStyleInAllFrames for fonts.

Instead of walking the frame tree twice, nuking the style world the
second time, do normal font cache invalidation which lets StyleEngine
handle the change in StyleEngine::fontsNeedUpdate.

TEST=fast/text/update-sans-serif-and-recalc-style.html

Review URL: https://codereview.chromium.org/1771823002

Cr-Commit-Position: refs/heads/master@{#379761}
2 files changed