Harshit Bansal c863bb83a0 html_diff: Migrate to use lxml. ...

We were using Google's diff-match-patch library to diff HTML. The
problem with that approach is that it is a text differ, not an HTML
differ and so it ends up messing up the HTML tags. `lxml` is a safer
option.

Fixes: #7219.

2017-10-30 14:10:35 -07:00

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