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On pre-L devices, each item in the list of search engines had too much
top padding and no bottom padding. Also, on all devices, clicking a
search engine didn't show a ripple or highlight. Both of these bugs have
been fixed.

BUG=482193

Review URL: https://codereview.chromium.org/1109263004

Cr-Commit-Position: refs/heads/master@{#327522}