[harfbuzz] enable dataflow config (#1632). (#3264)
[harfbuzz] enable dataflow config (#1632). (#3264)

Should work based on https://pantheon.corp.google.com/logs/viewer?resource=build%2Fbuild_id%2F3312be9f-7e2e-45c4-9544-eb432eba8c2e&project=oss-fuzz&minLogLevel=0&expandAll=false&timestamp=2020-01-21T22:51:43.343000000Z&customFacets=&limitCustomFacetWidth=true&dateRangeEnd=2020-01-21T22:51:41.725Z&interval=PT1H&dateRangeUnbound=backwardInTime&scrollTimestamp=2020-01-21T21:13:26.578865217Z, but double checking with Travis.
robertswiecki/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,google/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,FeliciaLim/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,google/oss-fuzz,FeliciaLim/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,FeliciaLim/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,google/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,FeliciaLim/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz