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Link icon will be enlarged when there is only one line of attribution.
The size of the link icon will still correspond to the text size when
there are two lines of attribution.

Screencast:
https://screencast.googleplex.com/cast/NTQwNTYzNTc2NDAyNzM5Mnw1ZjlmZGVjNC04Yg

Bug: 878917
Change-Id: I351569a1c260b4e5d0524c44bebdcdc8f67a4522
Reviewed-on: https://chromium-review.googlesource.com/1197425Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587884}