Convert linux_layout_tests_layout_ng to a non-NG bot

Now that LayoutNG is on by default, use this bot to run without
LayoutNG.

R=eae@chromium.org, thakis@chromium.org

Bug: 591099
Change-Id: I0d2a9fefed5830e2f83d198e3b196e346484b14f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674614
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672219}
1248 files changed