Remove mojo unit tests from WebKit Linux Oilpan bot
Remove mojo unit tests from WebKit Linux Oilpan bot

No need to test these for the time being.

BUG=
TBR=haraken
NOTRY=true

Review URL: https://codereview.chromium.org/1481323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362068}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk