remove ethernet turbo mode
remove ethernet turbo mode

BUG=skia:5332

Review-Url: https://codereview.chromium.org/2014683003

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot