MB: Add swarming bots in the FYI waterfall and remove memcheck swarming.
MB: Add swarming bots in the FYI waterfall and remove memcheck swarming.

BUG=chromium:657725
R=kjellander@webrtc.org
NOTRY=True

Review-Url: https://codereview.webrtc.org/2532943004
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#15320}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 3a864d2545a788b2b0b142cc60fec9ef2586b4e1

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