Remove RuncommandCaptureOutput and RunCommandQuietly

Switch to use RunCommand with capture_output=True and quiet=True.

BUG=chromium:339596
CQ-DEPEND=CL:184448
CQ-DEPEND=CL:184478
TEST=trybot runs

Change-Id: I2935839979e32e61f262aab5d4431fa66ab18808
Reviewed-on: https://chromium-review.googlesource.com/184474
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
4 files changed