py3: for statprof's Chrome output, write json to string, then encode to bytes
`json.dump(obj, fp)` requires `fp.write()` to accept str output, and
since the file pointer we have there only accepts bytes, we need to
change to json.dumps() and then encode as utf-8. We have already done
the same thing for the json (non-Chrome) format in
4b7eb862692e (py3:
encode json output to bytes and use write(), 2018-10-12).
Differential Revision: https://phab.mercurial-scm.org/D6781
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