Andrew Bonventre 2abb1b41e6 Small cleanup of gr-diff-comment-thread css
The border can just surround the thread itself. There doesn’t need
to be this roundabout way of doing it via *-of-type.

Change-Id: I310f0615984c80b7a9c46c255c9179b1f15e6e59
2016-05-07 17:50:16 -04:00
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