autotest: do not upload perf data from branches.

This easily confuses perf dashboard users.
Also update the samples in the unittest to mirror current versions.

BUG=chromium:365051,chromium:342552
TEST=perf_uploader_unittest.py

Change-Id: I585e829f56c41d2733bfa9b41fc1e871f7b4bbc9
Reviewed-on: https://chromium-review.googlesource.com/229750
Reviewed-by: Fang Deng <fdeng@chromium.org>
Tested-by: Ilja Friedel <ihf@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Ilja Friedel <ihf@chromium.org>
2 files changed