Don't reboot Pixel C or Nexus Player before task

We reboot this after in swarming with real adb, so this
is unnecessary and could, in fact, be harmful.

Bug: skia:6559
NOTRY=true
Change-Id: Iaf58416994637111c02013fe3c83f4ac92de2a66
Reviewed-on: https://skia-review.googlesource.com/14526
Reviewed-by: Eric Boren <borenet@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
15 files changed